Fault, warning and safety-shutdown messages documented by Johnson Controls for the YORK YLAA. Each row cites the page of the manual it was taken from — nothing here is summarised or reworded.
From YLAA0070SE, 0080SE, 0090SE, 0100SE, 0115SE, 0120SE, 0135SE, 0150SE, 0155SE, 0170SE (Standard Efficiency) 0091HE, 0101HE, 0125HE, 0141HE, 0156HE, 0175HE (High Efficiency) Style A 60 Hz with... 150.72-NM1
Original: docs.johnsoncontrols.com
System Safeties
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| S Y S 1 L O W S U C T P R E S S S Y S 2 L O W S U C T P R E S S | Suction Pressure Cutout — a software cutout that helps protect the chiller from an evaporator freeze-up should the system attempt to run with a low refrigerant charge or a restriction in the refrigerant circuit. | Suction pressure falls below the ramped cutout point. At system start the cutout is set to 10% of the programmed value and ramps up to the programmed cutout point over the next 3 minutes; the cutout is completely ignored for the first 30 seconds of system run time. After the first 3 minutes, if the suction pressure falls below the programmed cutout setting, a "transient protection routine" is activated: the cutout is set at 10% of the programmed value and ramps up over the next 30 seconds; if at any time during this 30 seconds the suction pressure falls below the ramped cutout, the system stops. | System stops. Auto reset fault — the system is allowed to restart automatically after the fault condition is no longer present; however, if 3 faults on the same system occur within 90 minutes, that system is locked out on the last fault (manual reset: the system switch under the OPTIONS key must be turned off and then back on). Manual warning: repeated starts after resetting a low suction pressure fault will cause evaporator freeze-up; whenever a system locks out on this safety or any safety, immediate steps should be taken to identify the cause. | 129 |
| S Y S 1 M P / H P C O F A U L T S Y S 2 M P / H P C O F A U L T | Motor Protector/Mechanical High Pressure Cutout — protects the compressor motor from overheating or the system from experiencing dangerously high discharge pressure. | Fault condition is present when CR1 (SYS 1) or CR2 (SYS 2) relays de-energize due to the HP switch or motor protector opening. The internal motor protector opens at 185°F – 248°F (85°C – 120°C) and auto resets; the mechanical HP switch opens at 585 PSIG plus or minus 10 PSIG (27.92 barg plus or minus .69 barg) and closes at 330 PSIG plus or minus 25 PSIG (22.75 barg plus or minus 1.72 barg). The compressor discharge temperature sensor also opens the motor protector circuit when it senses high internal scroll temperature (overheating due to inadequate cooling that may occur when refrigerant charge is low or superheat is too high). This message is displayed only after 3 shutdowns in 90 minutes, indicating the system is locked out and will not restart. | Whenever the motor protector or discharge sensor shuts down a compressor and the system, the internal compressor contacts open for a period of 30 minutes to assure that the motor or scroll temperatures have time to dissipate the heat and cool down; compressors will not be permitted to start during this period. The fault condition is cleared when a 30 VDC signal is restored to the input. After the third fault in 90 minutes the system is locked out — manual reset: the system switch under the OPTIONS key must be turned off and then back on. | 129 |
| S Y S 1 M P / H P C O I N H I B S Y S 2 M P / H P C O I N H I B | Motor Protector / High Pressure Cutout inhibit — displayed during the 30 minute timeout after a motor protector or discharge sensor shutdown, or when the HPCO is open. | The motor protector or discharge temperature sensor shut down a compressor and the system; the internal compressor contacts open for 30 minutes to assure that the motor or scroll temperatures have time to dissipate the heat and cool down, or the HPCO is open. During the first two faults this message is displayed and the system is not locked out. | While this message is displayed the compressors will not be permitted to start. After 30 minutes the contacts close and the system will be permitted to restart. Only after the third fault in 90 minutes will the MP/HPCO FAULT message be displayed (system locked out). | 129 |
| S Y S 1 H I G H D S C H P R E S S Y S 2 H I G H D S C H P R E S | Discharge Pressure Cutout — a software cutout in the microprocessor, backed up by a mechanical high pressure cutout switch located in the refrigerant circuit; assures that the system pressure does not exceed safe working limits. Discharge transducers must be installed for this function to operate. | Discharge pressure exceeded the programmable cutout. | System shuts down. Auto reset fault — the system will be allowed to restart when the discharge pressure falls 40 PSIG below the cutout. However, if 3 faults on the same system occur within 90 minutes, that system is locked out on the last fault (manual reset: the system switch under the OPTIONS key must be turned off and then back on). | 129 |
| S Y S 1 H I G H M T R C U R R S Y S 2 H I G H M T R C U R R | System high motor current safety — operates when the System Current Feedback option is installed and selected (Option 11 under OPTIONS key, Current Feedback). | The actual feedback voltage of the system, proportional to currents, exceeds the programmed trip voltage for 5 seconds. | System shutdown. Auto reset fault — the system is allowed to restart automatically after the fault condition is no longer present; however, if 3 faults on the same system occur within 90 minutes, that system is locked out on the last fault (manual reset: the system switch under the OPTIONS key must be turned off and then back on). | 130 |
Unit Safeties
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| U N I T F A U L T : L O W A M B I E N T T E M P | Low Ambient Temp Cutout — a safety shutdown designed to protect the chiller from operating in a low ambient condition. Unit faults cause all running compressors to be shut down and are auto reset faults. | The outdoor ambient temperature falls below the programmable cutout. | Chiller shuts down. Auto reset — the unit is allowed to restart automatically after the fault condition is no longer present; restart can occur when temperature rises 2°F above the cutoff. | 131 |
| U N I T F A U L T : L O W L I Q U I D T E M P | Low Leaving Chilled Liquid Temp Cutout — protects the chiller from an evaporator freeze-up should the chilled liquid temperature drop below the freeze point. Unit faults cause all running compressors to be shut down and are auto reset faults. | This situation could occur under low flow conditions or if the micro panel setpoint values are improperly programmed; anytime the leaving chilled liquid temperature (water or glycol) drops below the cutout point. | Chiller shuts down. Auto reset — restart can occur when chilled liquid temperature rises 2°F above the cutout. | 131 |
| U N I T F A U L T : 1 1 5 V A C U N D E R V O L T A G E | Under Voltage Safety — assures that the system is not operated at voltages where malfunction of the microprocessor could result in system damage. Unit faults cause all running compressors to be shut down and are auto reset faults. | The 115V AC to the micro panel drops below a certain level. | A unit fault is initiated to safely shut down the unit. Auto reset — restart is allowed after the unit is fully powered again and the anti-recycle timers have finished counting down. | 131 |
| U N I T F A U L T : H I G H M T R C U R R | Unit high motor current safety — active when the CURRENT FEEDBACK ONE PER UNIT option is selected under the OPTIONS key. Unit faults cause all running compressors to be shut down. | The voltage exceeds the programmed trip voltage for 5 seconds. The trip voltage is programmed at the factory according to compressor or unit RLA. | Unit shuts down. Restart will occur after the anti-recycle timer times out. | 131 |
Unit Warning
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| ! ! L O W B A T T E R Y ! ! C H E C K P R O G / S E T P / O P T N | Low Battery Warning — can only occur at unit power-up; on micro panel power-up the RTC battery is checked. Not a unit safety; not logged to the history buffer; will not auto-restart. | A low battery is found at power-up. All programmed setpoints, program values, options, time, schedule, and history buffers will be lost; these values will all be reset to their default values which may not be the desired operating values. | Once a faulty battery is detected, the unit will be prevented from running until the PROGRAM key is pressed; once PROGRAM is pressed the anti-recycle timers will be set to the programmed anti-recycle time to allow the operator time to check setpoints and, if necessary, reprogram programmable values and options. If a low battery is detected, it should be replaced as soon as possible (RTC/battery 031-02565-000, located at U5 on the microboard); the programmed values will all be lost and the unit will be prevented from running on the next power interruption. Operator intervention is required to allow a restart of the chiller. | 131 |
| I N C O R R E C T U N I T T Y P E | Incorrect Unit Type warning — indicates the condensing unit jumper is installed. Not a unit safety; not logged to the history buffer; will not auto-restart. | Condensing unit jumper installed between J11-12 and J11-7. | This jumper must be removed to operate the chiller. Operator intervention is required to allow a restart of the chiller. | 131 |
Troubleshooting
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| NO DISPLAY ON PANEL. UNIT WILL NOT OPERATE. | 1. No 115VAC to 24 VAC Transformer. 2. No 24VAC to Microboard. 3. Control Transformer defective, no 24VAC output. 4. Short in wire to temp. sensors or pressure transducers. 5. Defective IPU II & I/O Board or the Display Board. | 1a. Check wiring and fuse 1FU. 1b. Check wiring emergency stop contacts 5 to L of XTBC2 Terminal Block. 1c. Replace Control Transformer. 2. Check wiring Control Transformer to Microboard. 3. Replace Control Transformer. 4. Unplug connections at IPU II & I/O Board to isolate. 5. Replace IPU II & I/O Board or the Display Board. Contact Johnson Controls Service before replacing circuit Boards! | 174 | |
| FLOW SWITCH/REM STOP NO RUN PERMISSIVE | 1. No chilled liquid flow. 2. Flow switch improperly installed. 3. Defective flow switch. 4. Remote cycling device open. | 1. Check chilled liquid flow. 2. Check that the flow switch is installed according to manufacturer's instructions. 3. Replace flow switch. 4. Check cycling devices connected to terminals 13 and 14 of the XTBC1 Terminal Block. | 174 | |
| LOW SUCTION PRESSURE FAULT | 1. Improper suction pressure cutouts adjustments. 2. Low refrigerant charge. 3. Fouled filter dryer. 4. TXV defective. 5. Reduced flow of chilled liquid through the cooler. 6. Defective suction pressure transducer/low pressure switch or wiring. 7. LLSV defective | 1. Adjust per recommended settings. 2. Repair leak if necessary and add refrigerant. 3. Change dryer/core. 4. Replace TXV. 5. Check GPM (See "Limitations" liquid through the cooler in Installation section). Check operation of pump, clean pump strainer, purge chilled liquid system of air. 6. Replace transducer/low pressure switch or faulty switch or wiring. Refer to "Service" section for pressure/voltage formula. 7. Replace LLSV | 174 | |
| HIGH DISCHARGE PRESSURE FAULT | 1. Condenser fans not operating or operating backwards. 2. Too much refrigerant. 3. Air in refrigerant system. 4. Defective discharge pressure transducer. | 1. Check fan motor, and contactors. Assure fan blows air upward. 2. Remove refrigerant. 3. Evacuate and recharge system. 4. Replace discharge pressure transducer. Refer to Service section for pressure/voltage formula. | 174 | |
| LOW LIQUID TEMP FAULT | 1. Improperly adjusted leaving chilled liquid temp. cutout (glycol only). 2. Micro panel setpoint/range values improperly programmed. 3. Chilled liquid flow too low. 4. Defective LWT or RWT sensor (assure the sensor is properly installed in the bottom of the well with a generous amount of heat conductive compound). | 1. Re-program the leaving chilled liquid temp. cutout. 2. Re-adjust setpoint/range. 3. Increase chilled liquid flow. Refer to Limitations in Installation section. 4. Compare sensor against a known good Temperature sensing device. Refer to Service section for temp./voltage table. | 175 | |
| MP / HPCO FAULT | 1. Compressor internal motor protector (MP) open. 2. External overload tripped. 3. HPCO switch open. 4. Defective HPCO switch. 5. Defective CR relay. | 1. Verify refrigerant charge is not low. Verify superheat setting of 10°F to 15°F (5.6°C to 8.3°C). Verify correct compressor rotation. Verify compressor is not overloaded. 2. Determine cause and reset. 3. See "High Press. Disch." Fault. 4. Replace HPCO switch. 5. Replace relay. | 175 | |
| COMPRESSOR(S) WON'T START | 1. Demand not great enough. 2. Defective water temperature sensor. 3. Contactor/Overload failure. 4. Compressor failure. | 1. No problem. Consult "Installation" Manual to aid in understanding compressor operation and capacity control. 2. Compare the display with a thermometer. Should be within +/- 2 degrees. Refer to Service section for RWT/LWT temp./voltage table. 3. Replace defective part. 4. Diagnose cause of failure and replace. | 175 | |
| LACK OF COOLING EFFECT | 1. Fouled evaporator surface. Low suction pressure will be observed. 2. Improper flow through the evaporator. 3. Low refrigerant charge. Low suction pressure will be observed. | 1. Contact the local Johnson Controls service representative. 2. Reduce flow to within chiller design specs. See Limitations in Installation section. 3. Check subcooling and add charge as needed. | 175 |
Real Time Error Numbers
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| ## 1 | DATUM TYPE OK TEST FAILED | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 2 | ENGLISH TEXT TOO LONG | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 3 | FLOATING POINT EXCEPTION | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 4 | GET PACKET FAILED | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 5 | GET TYPE FAILED | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 6 | INVALID UNIT CONVERSION | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 7 | INVALID HARDWARE SELECTION | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 8 | REAL TIME FAULT | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 9 | SPANISH TEXT TOO LONG | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 10 | THREAD EXITED | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 11 | THREAD FAILED | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 12 | THREAD STALLED | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 13 | IO BOARD RESET | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 14 | BRAM INVALID | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 | |
| ## 15 | BACNET SETUP FAILED | Reset via the "RESET REAL TIME ERROR" setting (set RESET 1 = YES, 0 = NO). Reboot (cycle power) required after settings are changed. | 184 |
From YLAA0070SE, 0080SE, 0090SE, 0100SE, 0115SE, 0120SE, 0136SE, 0150SE, 0155SE, 0170SE (Standard Efficiency) 0091HE, 0101HE, 0125HE, 0141HE, 0156HE, 0175HE (High Efficiency) Style A, B, C 60 Hz with... 150.72-NM2
Original: docs.johnsoncontrols.com
System Safeties
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| S Y S 1 H I G H D S C H P R E S S Y S 2 H I G H D S C H P R E S | Discharge Pressure Cutout. Software cutout in the microprocessor, backed up by a mechanical high pressure cutout switch located in the refrigerant circuit; assures the system pressure does not exceed safe working limits. | Programmable discharge pressure cutout exceeded. Troubleshooting causes: condenser fans not operating or operating backwards; too much refrigerant; air in refrigerant system; defective discharge pressure transducer. | System shuts down when the programmable cutout is exceeded; restart is allowed when the discharge pressure falls 40 PSIG below the cutout. Discharge transducers must be installed for this function to operate. Auto reset: the system restarts automatically after the fault condition is no longer present; however, if 3 faults on the same system occur within 90 minutes, that system is locked out on the last fault (manual reset — turn the system switch under the OPTIONS key OFF and then back ON to clear). Solutions: check fan motor and contactors, assure fan blows air upward; remove refrigerant; evacuate and recharge system; replace discharge pressure transducer. | 127 |
| S Y S 1 L O W S U C T P R E S S S Y S 2 L O W S U C T P R E S S | Suction Pressure Cutout. Software cutout that helps protect the chiller from an evaporator freeze-up should the system attempt to run with a low refrigerant charge or a restriction in the refrigerant circuit. | Suction pressure fell below the programmed cutout. Troubleshooting causes: improper suction pressure cutout adjustments; low refrigerant charge; fouled filter dryer; TXV defective; reduced flow of chilled liquid through the cooler; defective suction pressure transducer / low pressure switch or wiring; LLSV defective. | At system start the cutout is set to 10% of the programmed value and ramped up to the programmed cutout point during the next 3 minutes (completely ignored for the first 30 seconds of system run time); the system stops if suction pressure falls below the ramped cutout. After the first 3 minutes, a “transient protection routine” sets the cutout at 10% of the programmed value and ramps it up over the next 30 seconds; the system stops if suction pressure falls below the ramped cutout. Repeated starts after resetting a low suction pressure fault will cause evaporator freeze-up — whenever a system locks out on this safety or any safety, immediate steps should be taken to identify the cause. Auto reset; if 3 faults on the same system occur within 90 minutes the system locks out on the last fault (clear by turning the system switch under OPTIONS OFF, then back ON). Solutions: adjust per recommended settings; repair leak if necessary and add refrigerant; change dryer/core; replace TXV; check GPM, check operation of pump, clean pump strainer, purge chilled liquid system of air; replace transducer/low pressure switch or faulty wiring; replace LLSV. | 127 |
| S Y S 1 M P / H P C O F A U L T S Y S 2 M P / H P C O F A U L T | Motor Protector / Mechanical High Pressure Cutout fault. Protects the compressor motor from overheating or the system from experiencing dangerously high discharge pressure. Displayed only after the third shutdown in 90 minutes — the system is locked out and will not restart. | CR1 (SYS 1) or CR2 (SYS 2) relays de-energize due to the HP switch or motor protector opening, causing 0VDC to be read on the inputs to the microboard. The internal motor protector opens at 185 °F to 248 °F (85 °C to 120 °C) and auto resets; the mechanical HP switch opens at 585 PSIG plus or minus 10 PSIG and closes at 330 PSIG plus or minus 25 PSIG. The compressor discharge temperature sensor also opens the motor protector circuit when it senses high internal scroll temperature (inadequate cooling — refrigerant charge low, or superheat too high). Troubleshooting causes: compressor internal motor protector (MP) open; external overload tripped; HPCO switch open; defective HPCO switch; defective CR relay. | Fault condition is cleared when a 30VDC signal is restored to the input. During the first two faults an MP/HP INHIBIT message is displayed and the system is not locked out; only after the third fault in 90 minutes is the MP/HPCO FAULT message displayed, indicating the system is locked out and will not restart. Internal compressor contacts open for 30 minutes so motor or scroll temperatures can dissipate heat; after 30 minutes the contacts close and the system is permitted to restart. Solutions: verify refrigerant charge is not low; verify superheat setting of 10 °F to 15 °F; verify correct compressor rotation; verify compressor is not overloaded; determine cause and reset external overload; see High Press. Disch. Fault; replace HPCO switch; replace relay. | 127 |
| S Y S 1 M P / H P C O I N H I B S Y S 2 M P / H P C O I N H I B | Motor Protector / High Pressure Cutout inhibit. Displayed while the internal compressor contacts are open or when the HPCO is open; the compressors will not be permitted to start. | The motor protector or discharge temperature sensor shut down a compressor and the system; the internal compressor contacts open for a period of 30 minutes to assure the motor or scroll temperatures have time to dissipate the heat and cool down. Also displayed when the HPCO is open. | While this message is displayed the compressors will not be permitted to start. After 30 minutes the contacts close and the system is permitted to restart. During the first two faults this message is displayed and the system is not locked out; only after the third fault in 90 minutes is the MP/HPCO FAULT message displayed (lockout). | 127 |
| S Y S 1 H I G H M T R C U R R S Y S 2 H I G H M T R C U R R | System high motor current safety (operates when the System Current Feedback option is installed and selected — Option 11 under OPTIONS key). | The actual feedback voltage of the system, proportional to currents, exceeds the programmed trip voltage for 5 seconds; or the suction temperature or suction pressure sensors read out of range high or low (condition present for 3 seconds). | System shutdown. This safety locks out a system after the first fault and will not allow automatic restarting. | 128 |
Unit Safeties
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| U N I T F A U L T : L O W A M B I E N T T E M P | Low Ambient Temp Cutout. Safety shutdown designed to protect the chiller from operating in a low ambient condition. Causes all running compressors to be shut down. | Outdoor ambient temperature fell below the programmable cutout. | Chiller shuts down. Auto reset: restart can occur when temperature rises 2 °F above the cutoff. | 128 |
| U N I T F A U L T : L O W L I Q U I D T E M P | Low Leaving Chilled Liquid Temp Cutout. Protects the chiller from an evaporator freeze-up should the chilled liquid temperature drop below the freeze point. Causes all running compressors to be shut down. | Leaving chilled liquid temperature (water or glycol) dropped below the cutout point — could occur under low flow conditions or if the micro panel setpoint values are improperly programmed. Troubleshooting causes: improperly adjusted leaving chilled liquid temp. cutout (glycol only); micro panel setpoint/range values improperly programmed; chilled liquid flow too low; defective LWT or RWT sensor. | Chiller shuts down. Auto reset: restart can occur when chilled liquid temperature rises 2 °F above the cutout. Solutions: re-program the leaving chilled liquid temp. cutout; re-adjust setpoint/range; increase chilled liquid flow; compare sensor against a known good temperature sensing device. | 128 |
| U N I T F A U L T : 1 1 5 V A C U N D E R V O L T A G E | Under Voltage Safety. Assures that the system is not operated at voltages where malfunction of the microprocessor could result in system damage. Causes all running compressors to be shut down. | 115V AC to the micro panel drops below a certain level. | A unit fault is initiated to safely shut down the unit. Auto reset: restart is allowed after the unit is fully powered again and the anti-recycle timers have finished counting down. | 128 |
| U N I T F A U L T : H I G H M T R C U R R | Unit high motor current safety (active when the CURRENT FEEDBACK ONE PER UNIT option is selected under the OPTIONS key). Causes all running compressors to be shut down. | Voltage exceeds the programmed trip voltage for 5 seconds. The trip voltage is programmed at the factory according to compressor or unit RLA. | Unit shuts down. Auto reset: restart will occur after the anti-recycle timer times out. | 128 |
Unit Warning
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| ! ! L O W B A T T E R Y ! ! C H E C K P R O G / S E T P / O P T N | Low Battery Warning. Not a unit safety; not logged to the history buffer. Can only occur at unit power-up. | On micro panel power-up the RTC battery is checked and a low battery is found. All programmed setpoints, program values, options, time, schedule, and history buffers are lost and reset to their default values, which may not be the desired operating values. | Will not auto-restart — operator intervention is required to allow a restart of the chiller. The unit is prevented from running until the PROGRAM key is pressed; once PROGRAM is pressed, the anti-recycle timers are set to the programmed anti-recycle time to allow the operator time to check setpoints and, if necessary, reprogram programmable values and options. Replace the battery as soon as possible — RTC/battery (031-02565-000) is located at U5 on the microboard; the programmed values will all be lost and the unit will be prevented from running on the next power interruption. | 129 |
| I N C O R R E C T U N I T T Y P E | Incorrect unit type warning. Not a unit safety; not logged to the history buffer. | The condensing unit jumper is installed between J11-12 and J11-7. | Will not auto-restart — operator intervention is required to allow a restart of the chiller. This jumper must be removed to operate the chiller. | 129 |
Option 17 – Flash Card Update
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| F L A S H C A R D U P D A T E E R R O R XXXXX | Flash Card operating-software update ended in an error; XXXXX is the error code. No reboot occurs. | Incorrect Flash Card utilized; incorrect chiller software; the Flash Card is most likely defective; or the IPU and I/O combo board is bad. | If the update resulted in an error, the original program will still be active. Assure the correct Flash Card was utilized — incorrect chiller software will cause an error; if this is not the case, the Flash Card is most likely defective or the IPU and I/O combo board is bad. | 150 |
Real Time Error Numbers
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| REAL TIME ERROR 1 | DATUM TYPE OK TEST FAILED | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 2 | ENGLISH TEXT TOO LONG | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 3 | FLOATING POINT EXCEPTION | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 4 | GET PACKET FAILED | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 5 | GET TYPE FAILED | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 6 | INVALID UNIT CONVERSION | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 7 | INVALID HARDWARE SELECTION | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 8 | REAL TIME FAULT | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 9 | SPANISH TEXT TOO LONG | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 10 | THREAD EXITED | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 11 | THREAD FAILED | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 12 | THREAD STALLED | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 13 | IO BOARD RESET | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 14 | BRAM INVALID | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 | |
| REAL TIME ERROR 15 | BACNET SETUP FAILED | Reset via the RESET REAL TIME ERROR setting (1 = YES, 0 = NO). | 182 |
From YLAA0180SE, 0210SE, 0241SE, 0286SE, 0320SE, 0360SE, 400SE, 0435SE, 0485SE (Standard Efficiency) 0195HE, 0221HE, 0261HE, 0262HE, 0301HE, 0350HE, 0391HE, 0392HE, 0442H, 0457HE, 0517HE (High Efficiency)... 150.72-ICOM7
Original: docs.johnsoncontrols.com
System Safeties
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| SYS 1 HIGH DSCH PRES SYS 2 HIGH DSCH PRES | The Discharge Pressure Cutout is a software cutout in the microprocessor and is backed-up by a mechanical high pressure cutout switch located in the refrigerant circuit. It ensures that the system pressure does not exceed safe working limits. | System safeties shut the individual system down if a safety threshold is exceeded for 3 seconds. The system shuts down when the programmable cutout is exceeded and is allowed to restart when the discharge pressure falls 40 PSIG below the cutout; discharge transducers must be installed for this function to operate. Auto reset: the system restarts automatically after the fault condition is no longer present; if 3 faults on the same system occur within 90 minutes, the system locks out on the last fault — a manual reset: turn the system switch (under OPTIONS key) OFF and then back ON to clear the lockout fault. | 118 | |
| SYS 1 LOW SUCT PRESS SYS 2 LOW SUCT PRESS | The Suction Pressure Cutout is a software cutout that helps protect the chiller from an evaporator freeze-up should the system attempt to run with a low refrigerant charge or a restriction in the refrigerant circuit. | Low refrigerant charge or a restriction in the refrigerant circuit. | At system start the cutout is set to 10% of the programmed value and ramped up to the programmed cutout point over the next 3 minutes; the cutout is completely ignored for the first 30 s of system run time. After the first 3 min, if the suction pressure falls below the programmed cutout setting, a transient protection routine sets the cutout at 10% of the programmed value and ramps it up over the next 30 s; the system stops if the suction pressure falls below the ramped cutout. WARNING: repeated starts after resetting a low suction pressure fault will cause evaporator freeze-up — whenever a system locks out on this safety, immediate steps should be taken to identify the cause. Auto reset with lockout on the third fault in 90 minutes; clear the lockout by turning the system switch (under OPTIONS key) OFF and then back ON. | 169 |
| SYS 1 MP/HPCO FAULT SYS 2 MP/HPCO FAULT | Motor Protector/Mechanical High Pressure Cutout — protects the compressor motor from overheating or the system from experiencing dangerously high discharge pressure. The fault condition is present when CR1 (SYS 1) or CR2 (SYS 2) relays de-energize due to the HP switch or motor protector opening, causing 0 VDC to be read on the inputs to the microboard; the fault condition is cleared when a 30 VDC signal is restored to the input. The internal motor protector opens at 185°F to 248°F (85°C to 120°C) and auto resets; the mechanical HP switch opens at 585 PSIG plus or minus 10 psig (27.92 barg plus or minus .69 barg) and closes at 330 psig plus or minus 25 psig (22.75 barg plus or minus 1.72 barg). | Inadequate cooling of the scrolls — refrigerant charge low, or superheat too high (compressor discharge temperature sensor); compressor motor overheating; dangerously high discharge pressure. | During the first two faults an MP/HP INHIBIT message is displayed and the system is not locked out; only after the third fault in 90 min is the MP/HPCO FAULT message displayed, indicating the system is locked out and will not restart. Whenever the motor protector or discharge sensor shuts down a compressor and the system, the internal compressor contacts open for a period of 30 min so the motor or scroll temperatures can dissipate heat and cool down; after 30 min the contacts close and the system is permitted to restart. Clear a lockout by turning the system switch OFF and then back ON (under OPTIONS key). | 168 |
| SYS 1 MP/HPCO INHIB SYS 2 MP/HPCO INHIB | Motor Protector/High Pressure Inhibit — displayed while the internal compressor contacts are open (30-minute timeout) or when the HPCO is open, after the motor protector or discharge temperature sensor has shut down a compressor and the system. | While this message is displayed, the compressors will not be permitted to start. After 30 min, the contacts will close and the system will be permitted to restart. | 168 | |
| SYS 1 HIGH MTR CURR SYS 2 HIGH MTR CURR | With the System Current Feedback option installed and selected (Current Feedback option under the OPTIONS key): if the actual feedback voltage of the system, proportional to currents, exceeds the programmed trip voltage for 5 seconds, the system will shut down. | Auto reset: the system restarts automatically after the fault condition is no longer present; if 3 faults on the same system occur within 90 minutes, the system locks out on the last fault — turn the system switch OFF and then back ON to clear the lockout fault. | 118 | |
| Sensor Failure (EEV) | This safety shuts down a system if either suction temperature or suction pressure sensors read out of range high or low. The condition must be present for 3 s to cause a system shutdown. | Suction temperature or suction pressure sensor reading out of range high or low. | The safety locks out a system after the first fault and will not allow automatic restarting (1X — locks out on the first fault). | 112 |
Unit Safeties
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| UNIT FAULT: LOW AMBIENT TEMP | The Low Ambient Temp Cutout is a safety shutdown designed to protect the chiller from operating in a low ambient condition. Unit safeties are faults that cause all running compressors to be shut down. | Outdoor ambient temperature falls below the programmable cutout. | The chiller shuts down. Restart can occur when temperature rises 2°F above the cutoff. Unit faults are auto reset faults: the unit is allowed to restart automatically after the fault condition is no longer present. | 112 |
| UNIT FAULT: LOW LIQUID TEMP | The Low Leaving Chilled Liquid Temp Cutout protects the chiller from an evaporator freeze-up should the chilled liquid temperature drop below the freeze point. Unit safeties are faults that cause all running compressors to be shut down. | Could occur under low flow conditions or if the micro panel set point values are improperly programmed. | Anytime the leaving chilled liquid temperature (water or glycol) drops below the cutout point, the chiller shuts down. Restart can occur when chilled liquid temperature rises 2°F above the cutout. Auto reset. | 112 |
| UNIT FAULT: 115VAC UNDERVOLTAGE | The Under Voltage Safety ensures that the system is not operated at voltages where malfunction of the microprocessor could result in system damage. | 115 V AC to the micro panel drops below a certain level. | A unit fault is initiated to safely shut down the unit. Restart is allowed after the unit is fully powered again and the anti-recycle timers have finished counting down. Auto reset. | 110 |
| UNIT FAULT: HIGH MTR CURR | With the CURRENT FEEDBACK ONE PER UNIT option selected under the OPTIONS key, the unit shuts down when the voltage exceeds the programmed trip voltage for 5 seconds. The trip voltage is programmed at the factory according to compressor or unit RLA. | Current feedback voltage exceeds the programmed trip voltage for 5 seconds. | Restart will occur after the anti-recycle timer times out. Auto reset. | 112 |
| FLOW SWITCH OPEN | Indicates the flow switch contacts connected to Terminals 13 and 14 of XTBC1 are open. | A 3-second delay is built into software to prevent nuisance shutdowns due to erroneous signals from the flow switch. Listed as Unit Fault code 31 (auto reset) in the YLAA Fault and Inhibit Codes. | 107 |
Unit Warning
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| !! LOW BATTERY !! CHECK PROG/SETP/OPTN | Unit warning — not a unit safety, not logged to the history buffer, and will not auto-restart; operator intervention is required to allow a restart. Can only occur at unit power-up: on micro panel power-up the RTC battery is checked, and if a low battery is found, all programmed set points, program values, options, time, schedule, and history buffers are lost and reset to their default values, which may not be the desired operating values. | Faulty RTC battery detected at power-up. | The unit is prevented from running until the PROGRAM key is pressed; pressing PROGRAM sets the anti-recycle timers to the programmed anti-recycle time to allow the operator time to check set points and, if necessary, reprogram programmable values and options. Replace the battery as soon as possible — RTC/battery (031-02565-000), located at U5 on the microboard; the unit will be prevented from running on the next power interruption. | 113 |
| INCORRECT UNIT TYPE | Unit warning — not a unit safety, not logged to the history buffer, and will not auto-restart; operator intervention is required to allow a restart. Indicates the condensing unit jumper is installed between J11-12 and J11-7. | Condensing unit jumper installed between J11-12 and J11-7. | The jumper must be removed to operate the chiller. | 113 |
YLAA Fault and Inhibit Codes
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| 2 | Unit Fault — Low Ambient Temperature | AUTO — allows restart once meeting the required conditions | 112 | |
| 4 | Unit Fault — Low Leaving Chilled Liquid Temperature | AUTO — allows restart once meeting the required conditions | 112 | |
| 22 | Unit Fault — Unit High Motor Current (Unit Current Feedback Option) | AUTO — allows restart once meeting the required conditions | 112 | |
| 27 | Unit Fault — Pump Trip (Hydro Pumps 1 or Hydro Pumps 2) | AUTO — allows restart once meeting the required conditions | 112 | |
| 28 | Unit Fault — Pump Flow Failure (Hydro Pumps 1 or Hydro Pumps 2) | 1X — locks out on the first fault | 112 | |
| 29 | Unit Fault — High Ambient Temperature | AUTO — allows restart once meeting the required conditions | 112 | |
| 31 | Unit Fault — Flow Switch Open | AUTO — allows restart once meeting the required conditions | 112 | |
| 5 | System Fault — High Discharge Pressure (Software) | 3X — automatically restarts on the first and second fault with a lockout on the third fault in 90 minutes | 112 | |
| 7 | System Fault — Low Suction Pressure | 3X — automatically restarts on the first and second fault with a lockout on the third fault in 90 minutes | 112 | |
| 17 | System Fault — System High Motor Current (System Current Feedback option) | 3X — automatically restarts on the first and second fault with a lockout on the third fault in 90 minutes | 112 | |
| 18 | System Fault — Motor Protector/High Pressure (Mechanical) | 3X — automatically restarts on the first and second fault with a lockout on the third fault in 90 minutes | 112 | |
| 19 | System Fault — Low Evaporator Temperature (R407c Only - N/A Hp Heating Mode) | 3X — automatically restarts on the first and second fault with a lockout on the third fault in 90 minutes | 112 | |
| 23 | System Fault — Low Suction Superheat (EEV) | 3X — automatically restarts on the first and second fault with a lockout on the third fault in 90 minutes | 112 | |
| 24 | System Fault — Sensor Failure (EEV) | 1X — locks out on the first fault | 112 | |
| 25 | System Fault — Discharge Inhibit (Heat Pump heating mode only) | 3X — automatically restarts on the first and second fault with a lockout on the third fault in 90 minutes | 112 | |
| 26 | System Inhibit — Motor Protector/High Pressure Inhibit | AUTO — allows restart once meeting the required conditions | 112 |
Fault/Inhibit Code Names (Native BACnet, Modbus, and N2 Communications Data Map)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Lockout | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Unit Fault Low Leaving Chilled Liquid Temperature | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| High Discharge Pressure | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Low Ambient Temperature | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| System Fault | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Low Suction Pressure | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Unit Motor Current | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Low Superheat | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Sensor Fault | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Discharge Inhibit | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| MP/HPCO Inhibit | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| MP/HPCO Fault | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Leaving Chilled Liquid Temperature Sensor Fault | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Flow Switch Open | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Pump Trip | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Pump Fail Make Flow | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| High Ambient Temperature | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Anti-Vacuum Low Pressure Cutout | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 | ||
| Low Evaporator Temperature | Fault/inhibit code name in the Native BACnet, Modbus, and N2 communications data map (reported via the Sys 1 / Sys 2 Fault Code points). | 147 |
Troubleshooting
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| NO DISPLAY ON PANEL. UNIT WILL NOT OPERATE | 1. No 115 VAC to 24 VAC Transformer. 2. No 24 VAC to Microboard. 3. Control Transformer defective, no 24 VAC output. 4. Short in wire to temp. sensors or pressure transducers. 5. Defective IPU II & I/O Board or the Display Board. | 1a. Check wiring and fuse 1FU. 1b. Check wiring emergency stop contacts 5 to L of XTBC2 Terminal Block. 1c. Replace Control Transformer. 2. Check wiring Control Transformer to Microboard. 3. Replace Control Transformer. 4. Unplug connections at IPU II & I/O Board to isolate. 5. Replace IPU II & I/O Board or the Display Board. Contact Johnson Controls Service before replacing circuit Boards! | 179 | |
| FLOW SWITCH/REM STOP NO RUN PERMISSIVE | 1. No chilled liquid flow. 2. Flow switch improperly installed. 3. Defective flow switch. 4. Remote cycling device open. | 1. Check chilled liquid flow. 2. Check that the flow switch is installed according to manufacturer’s instructions. 3. Replace flow switch. 4. Check cycling devices connected to terminals 13 and 14 of the XTBC1 Terminal Block. | 179 | |
| LOW SUCTION PRESSURE FAULT | 1. Improper suction pressure cutouts adjustments. 2. Low refrigerant charge. 3. Fouled filter dryer. 4. TXV defective. 5. Reduced flow of chilled liquid through the cooler. 6. Defective suction pressure transducer/low pressure switch or wiring. 7. LLSV defective | 1. Adjust per recommended settings. 2. Repair leak if necessary and add refrigerant. 3. Change dryer/core. 4. Replace TXV. 5. Check GPM (See Operational Limitations on page 45). Check operation of pump, clean pump strainer, purge chilled liquid system of air. 6. Replace transducer/low pressure switch or faulty switch or wiring. See SECTION 9 – SERVICE AND TROUBLESHOOTING for pressure/voltage formula. 7. Replace LLSV | 179 | |
| HIGH DISCHARGE PRESSURE FAULT | 1. Condenser fans not operating or operating backwards. 2. Too much refrigerant. 3. Air in refrigerant system. 4. Defective discharge pressure transducer. | 1. Check fan motor, and contactors. Ensure fan blows air upward. 2. Remove refrigerant. 3. Evacuate and recharge system. 4. Replace discharge pressure transducer. See SECTION 9 – SERVICE AND TROUBLESHOOTING for pressure/voltage formula. | 179 | |
| LOW LIQUID TEMP FAULT | 1. Improperly adjusted leaving chilled liquid temp. cutout (glycol only). 2. Micro panel set point/range values improperly programmed. 3. Chilled liquid flow too low. 4. Defective LWT or RWT sensor (ensure the sensor is properly installed in the bottom of the well with a generous amount of heat conductive compound). | 1. Re-program the leaving chilled liquid temp. cutout. 2. Re-adjust set point/range. 3. Increase chilled liquid flow. See Operational Limitations on page 45). 4. Compare sensor against a known good Temperature sensing device. See Table 35 on page 172. | 180 | |
| MP / HPCO FAULT | 1. Compressor internal motor protector (MP) open. 2. External overload tripped. 3. HPCO switch open. 4. Defective HPCO switch. 5. Defective CR relay. | 1. Verify refrigerant charge is not low. Verify superheat setting of 10°F to 15°F (5.6°C to 8.3°C). Verify correct compressor rotation. Verify compressor is not overloaded. 2. Determine cause and reset. 3. See High Press. Disch. Fault. 4. Replace HPCO switch. 5. Replace relay. | 180 | |
| COMPRESSORS WON’T START | 1. Demand not great enough. 2. Defective water temperature sensor. 3. Contactor/Overload failure. 4. Compressor failure. | 1. No problem. Consult Installation Manual to aid in understanding compressor operation and capacity control. 2. Compare the display with a thermometer. Should be within plus or minus 2 degrees. See Table 35 on page 172 for RWT/LWT temp./voltage table. 3. Replace defective part. 4. Diagnose cause of failure and replace. | 180 | |
| LACK OF COOLING EFFECT | 1. Fouled evaporator surface. Low suction pressure will be observed. 2. Improper flow through the evaporator. 3. Low refrigerant charge. Low suction pressure will be observed. | 1. Contact the local Johnson Controls service representative. 2. Reduce flow to within chiller design specs. See Operational Limitations on page 45). 3. Check subcooling and add charge as needed. | 180 |
Real Time Error Numbers
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| 1 | DATUM TYPE OK TEST FAILED | 143 | ||
| 2 | ENGLISH TEXT TOO LONG | 143 | ||
| 3 | FLOATING POINT EXCEPTION | 143 | ||
| 4 | GET PACKET FAILED | 143 | ||
| 5 | GET TYPE FAILED | 143 | ||
| 6 | INVALID UNIT CONVERSION | 143 | ||
| 7 | INVALID HARDWARE SELECTION | 143 | ||
| 8 | REAL TIME FAULT | 143 | ||
| 9 | SPANISH TEXT TOO LONG | 143 | ||
| 10 | THREAD EXITED | 143 | ||
| 11 | THREAD FAILED | 143 | ||
| 12 | THREAD STALLED | 143 | ||
| 13 | IO BOARD RESET | 143 | ||
| 14 | BRAM INVALID | 143 | ||
| 15 | BACNET SETUP FAILED | 143 |
Flash Card Update Error
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| FLASH CARD UPDATE ERROR XXXXX | Displayed, with the error code, if an error occurred during a Flash Card software update; no reboot will occur and the original program will still be active. | Incorrect chiller software (wrong Flash Card used); if this is not the case, the Flash Card is most likely defective or the IPU and I/O combo board is bad. | Ensure the correct Flash Card was used — incorrect chiller software will cause an error; if the correct card was used, the Flash Card is most likely defective or the IPU and I/O combo board is bad. | 136 |
From YLAA0195 - YLAA0517 Air-Cooled Scroll Chillers with Brazed Plate Heat Exchanger Style B (50Hz) 4 fan to 8 fan 55 Ton to 150 Ton 196 kW to 520 kW 150.72-ICOM8
Original: docs.johnsoncontrols.com
YorkTalk 2 Fault Codes (may not be available on all models)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| 0 | No Fault Code | 117 | ||
| 1 | VAC Undervoltage | 117 | ||
| 2 | Low Ambient Temperature | 117 | ||
| 3 | High Ambient Temperature | 117 | ||
| 4 | Low Leaving Chilled Liquid Temperature | 117 | ||
| 5 | High Discharge Pressure | 117 | ||
| 6 | High Differential Oil Pressure | 117 | ||
| 7 | Low Suction Pressure | 117 | ||
| 8 | High Motor Current | 117 | ||
| 9 | LLSV Not On | 117 | ||
| 10 | Low Battery Warning | 117 | ||
| 11 | High Oil Temperature | 117 | ||
| 12 | High Discharge Temperature | 117 | ||
| 13 | Improper Phase Rotation | 117 | ||
| 14 | Low Motor Current / MP / HPCO | 117 | ||
| 15 | Motor Current Inpomabalanced | 117 | ||
| 16 | Low Differntail Oil Pressure | 117 | ||
| 17 | Grpound Fault | 117 | ||
| 18 | MP / HPCO Fault | 117 | ||
| 19 | Low Evaporator Temperature | 117 | ||
| 20 | Incorrect Refrigernat Programmed | 117 | ||
| 21 | Power Failure, Manual Reset Required | 117 | ||
| 22 | Unit Motor Current | 117 | ||
| 23 | Low Superheat | 117 | ||
| 24 | Sensor Fault | 117 | ||
| 25 | Discharge Inhibit | 117 | ||
| 26 | MP/HPCO Inhibit | 117 | ||
| 27 | Pump Trip | 117 | ||
| 28 | Pump Fail Make Flow | 117 | ||
| 29 | High Ambient Temperature | 117 |
Troubleshooting
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| NO DISPLAY ON PANEL. UNIT WILL NOT OPERATE | 1. No 220VAC to 24VAC Transformer. 2. No 24VAC to Microboard. 3. Control Transformer defective, no 24VAC output. 4. Short in wire to temp. sensors or pressure transducers. 5. Defective IPU II & I/O Board or the Display Board. | 1a. Check wiring and fuse 1FU. 1b. Check wiring emergency stop contacts 5 to L of XTBC2 Terminal Block. 1c. Replace Control Transformer. 2. Check wiring Control Transformer to Microboard. 3. Replace Control Transformer. 4. Unplug connections at IPU II & I/O Board to isolate. 5. Replace IPU II & I/O Board or the Display Board. Contact Johnson Controls Service before replacing circuit Boards! | 138 | |
| FLOW SWITCH/REM STOP NO RUN PERMISSIVE | 1. No chilled liquid flow. 2. Flow switch improperly installed. 3. Defective flow switch. 4. Remote cycling device open. | 1. Check chilled liquid flow. 2. Check that the flow switch is installed according to manufacturer’s instructions. 3. Replace flow switch. 4. Check cycling devices connected to terminals 13 and 14 of the XTBC1 Terminal Block. | 138 | |
| LOW SUCTION PRESSURE FAULT | 1. Improper suction pressure cutouts adjustments. 2. Low refrigerant charge. 3. Fouled filter dryer. 4. TXV defective. 5. Reduced flow of chilled liquid through the cooler. 6. Defective suction pressure transducer/low pressure switch or wiring. 7. LLSV defective | 1. Adjust per recommended settings. 2. Repair leak if necessary and add refrigerant. 3. Change dryer/core. 4. Replace TXV. 5. Check GPM (See Operational Limitations on page 35). Check operation of pump, clean pump strainer, purge chilled liquid system of air. 6. Replace transducer/low pressure switch or faulty switch or wiring. Refer to SECTION 9 – SERVICE AND TROUBLESHOOTING for pressure/voltage formula. 7. Replace LLSV | 138 | |
| HIGH DISCHARGE PRESSURE FAULT | 1. Condenser fans not operating or operating backwards. 2. Too much refrigerant. 3. Air in refrigerant system. 4. Defective discharge pressure transducer. | 1. Check fan motor, and contactors. Assure fan blows air upward. 2. Remove refrigerant. 3. Evacuate and recharge system. 4. Replace discharge pressure transducer. Refer to SECTION 9 – SERVICE AND TROUBLESHOOTING for pressure/voltage formula. | 138 | |
| LOW LIQUID TEMP FAULT | 1. Improperly adjusted leaving chilled liquid temp. cutout (glycol only). 2. Micro panel setpoint/range values improperly programmed. 3. Chilled liquid flow too low. 4. Defective LWT or RWT sensor (assure the sensor is properly installed in the bottom of the well with a generous amount of heat conductive compound). | 1. Re-program the leaving chilled liquid temp. cutout. 2. Re-adjust setpoint/range. 3. Increase chilled liquid flow. Refer to Operational Limitations on page 35). 4. Compare sensor against a known good Temperature sensing device. Refer to Table 26 on page 134 | 139 | |
| MP / HPCO FAULT | 1. Compressor internal motor protector (MP) open. 2. External overload tripped. 3. HPCO switch open. 4. Defective HPCO switch. 5. Defective CR relay. | 1. Verify refrigerant charge is not low. Verify superheat setting of 5.6°C to 8.3°C (10°F to 15°F). Verify correct compressor rotation. Verify compressor is not overloaded. 2. Determine cause and reset. 3. See High Press. Disch. Fault. 4. Replace HPCO switch. 5. Replace relay. | 139 | |
| COMPRESSOR(S) WON’T START | 1. Demand not great enough. 2. Defective water temperature sensor. 3. Contactor/Overload failure. 4. Compressor failure. | 1. No problem. Consult Installation Manual to aid in understanding compressor operation and capacity control. 2. Compare the display with a thermometer. Should be within plus or minus 2 degrees. Refer to Table 26 on page 134 for RWT/LWT temp./voltage table. 3. Replace defective part. 4. Diagnose cause of failure and replace. | 139 | |
| LACK OF COOLING EFFECT | 1. Fouled evaporator surface. Low suction pressure will be observed. 2. Improper flow through the evaporator. 3. Low refrigerant charge. Low suction pressure will be observed. | 1. Contact the local Johnson Controls service representative. 2. Reduce flow to within chiller design specs. See Operational Limitations on page 35). 3. Check subcooling and add charge as needed. | 139 |
From YLAA0041 - YLAA0230 Air-Cooled Scroll Chillers with Brazed Plate Heat Exchanger, Style B (60 Hz), 4 to 12 Fan, 40 ton to 230 ton, 140kW to 800 kW, Installation, Operation, Maintenance 150.72-ICOM6
Original: docs.johnsoncontrols.com
Unit Safeties
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| UNIT FAULT: LOW AMBIENT TEMP | Unit Fault Code 2 – Low Ambient Temperature Cutout | Outdoor ambient temperature falls below the programmable Low Ambient Temp Cutout setpoint. | Chiller shuts down. Auto reset: restart can occur when the temperature rises 2°F above the cutoff. | 144 |
| UNIT FAULT: LOW LIQUID TEMP | Unit Fault Code 4 – Low Leaving Chilled Liquid Temperature Cutout (evaporator freeze-up protection) | Leaving chilled liquid temperature (water or glycol) drops below the cutout point; can occur under low flow conditions or if the micro panel setpoint values are improperly programmed. | Chiller shuts down. Auto reset: restart can occur when chilled liquid temperature rises 2°F above the cutout. | 144 |
| UNIT FAULT: CHECK LIQ TEMP SENS | Check Liquid Temperature Sensor fault (unit fault) | While the unit is running and the control panel is programmed for leaving chilled liquid temperature control, the leaving chilled liquid temperature rises over 2.0°F above the entering chilled liquid temperature for 60 continuous seconds. Disabled if the Entering Chilled Liquid Temperature Sensor is disabled under Unit Setup. | Chiller shuts down; requires a manual reset to restart the unit. | 141 |
| UNIT FAULT: PUMP TRIP | Unit Fault Code 27 – Pump Trip (Hydro Pumps 1 or Hydro Pumps 2) | Single pump: the manual motor starter protecting the pump from short circuit or overload conditions has tripped or been set to OFF. Two pumps (duty and standby): both manual motor starters protecting the pumps have tripped or both have been set to OFF. | Setting the device to ON (at least one of the devices on dual-pump units) resets the trip. Auto per Table 15. | 144 |
| UNIT FAULT: PUMP FAIL MAKE FLOW | Unit Fault Code 28 – Pump Flow Failure (Hydro Pumps 1 or Hydro Pumps 2) | After the 30-second stop-to-start timer the pump is started (Leaving Liquid Temperature Cutout active, any compressor running, or daily schedule not calling for shutdown with unit switch ON and remote stop/start input closed) but the flow switch does not close within 10 seconds. On dual-pump units the running pump is stopped and the standby pump started; if the flow switch still does not close within a further 10 seconds the unit locks out. | Unit locks out and the running pump is stopped. Reset by setting the unit switch to OFF then back to ON. Locks out on the first fault (1x). When attempting to clear this fault, check that one of the manual motor starters protecting the pumps has not tripped. | 141 |
| UNIT FAULT: 115 VAC UNDER VOLTAGE | Under Voltage Safety (unit fault) | The 115 VAC to the micro panel drops below a certain level, where malfunction of the microprocessor could result in system damage. | A unit fault is initiated to safely shut down the unit. Restart is allowed after the unit is fully powered again and the anti-recycle timers have finished counting down. | 141 |
| UNIT FAULT: HIGH MTR CURR | Unit Fault Code 22 – Unit High Motor Current (Current Feedback One Per Unit option) | With the CURRENT FEEDBACK ONE PER UNIT option selected, the voltage exceeds the programmed trip voltage for 5 seconds. The trip voltage is programmed at the factory according to compressor or unit RLA. | Unit shuts down; restart occurs after the anti-recycle timer times out. Auto per Table 15. | 144 |
| FLOW SWITCH OPEN | Unit Fault Code 31 – Flow Switch Open | The flow switch contacts connected to Terminals 13 and 14 of XTBC1 are open. A 3-second delay is built into software to prevent nuisance shutdowns due to erroneous signals from the flow switch. | Auto per Table 15: allows restart once meeting the required conditions. | 137 |
| HIGH AMBIENT TEMPERATURE | Unit Fault Code 29 – High Ambient Temperature | Auto per Table 15/Table 16: allows restart once meeting the required conditions. | 144 |
Unit Warnings
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| !! LOW BATTERY !! CHECK PROG/SETP/OPTN | Low Battery Warning (unit warning; not a unit safety, not logged to the history buffer) | On micro panel power-up the RTC battery is checked and a low battery is found; all programmed setpoints, program values, options, time, schedule, and history buffers are lost and reset to their default values, which may not be the required operating values. | Unit is prevented from running until the PROGRAM key is pressed; pressing PROGRAM sets the anti-recycle timers to the programmed anti-recycle time to allow checking/reprogramming of values and options. Replace the RTC/battery (031-02565-000, located at U5 on the microboard) as soon as possible. Will not auto-restart; operator intervention required. | 145 |
| INCORRECT UNIT TYPE | Incorrect Unit Type warning | The condensing unit jumper is installed between J11-12 and J11-7. | This jumper must be removed to operate the chiller. Will not auto-restart; operator intervention required. | 145 |
System Safeties
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| SYS 1 HIGH DSCH PRES SYS 2 HIGH DSCH PRES | System Fault Code 5 – High Discharge Pressure (software cutout, backed up by the mechanical high pressure cutout switch in the refrigerant circuit) | The programmable discharge pressure cutout is exceeded; discharge transducers must be installed for this function. When an operating envelope is enabled, the effective cutout is set to 10 psig above the discharge pressure unload limit if suction pressure is less than 94.0 psig (standard envelope) or less than 42.0 psig (extended envelope). | System shuts down; restart allowed when the discharge pressure falls 40 psig below the cutout. 3x: automatic restart on the first and second fault with a lockout on the third fault within 90 minutes; clear the lockout by turning the system switch (under OPTIONS key) OFF and then back ON. | 150 |
| SYS 1 LOW SUCT PRESS SYS 2 LOW SUCT PRESS | System Fault Code 7 – Low Suction Pressure cutout (protects the chiller from evaporator freeze-up) | Suction pressure falls below the ramped cutout point: at system start the cutout is set to 10% of the programmed value and ramped up to the programmed point over 3 minutes (completely ignored for the first 30 seconds of run time); after the first 3 minutes, if suction pressure falls below the programmed cutout, a transient protection routine sets the cutout at 10% of the programmed value and ramps it up over the next 30 seconds. Can occur with a low refrigerant charge or a restriction in the refrigerant circuit. | System stops. 3x: automatic restart on the first and second fault with a lockout on the third fault in 90 minutes; clear the lockout via the system switch (under OPTIONS key) OFF then back ON. Repeated starts after resetting a low suction pressure fault will cause evaporator freeze-up – immediate steps should be taken to identify the cause. | 145 |
| SYS 1 SP/ FREEZE WARN SYS 2 SP/ FREEZE WARN | Suction pressure / freeze warning – transient protection routine active | After the first 3 minutes, the suction pressure falls below the programmed cutout setting; the cutout is set at 10% of the programmed value and ramped up over the next 30 seconds. Suction pressure transducers must be enabled for this function to work. | The system will stop if at any time during this 30 seconds the suction pressure falls below the ramped cutout. | 145 |
| SYS 1 MP/HPCO FAULT SYS 2 MP/HPCO FAULT | System Fault Code 18 – Motor Protector / Mechanical High Pressure Cutout fault | CR1 (SYS 1) or CR2 (SYS 2) relays de-energize due to the HP switch or motor protector opening, causing 0 VDC to be read on the microboard input. The internal motor protector opens at 185°F to 248°F (85°C to 120°C); the mechanical HP switch opens at 585 psig plus or minus 10 psig and closes at 330 psig plus or minus 25 psig. The compressor discharge temperature sensor also opens the motor protector circuit when it senses high internal scroll temperature (e.g., low refrigerant charge or superheat too high). Message displayed only after the third fault in 90 minutes. | System is locked out and will not restart; the fault condition is cleared when a 30 VDC signal is restored to the input. During the first two faults the MP/HP INHIBIT message is displayed and the system is not locked out. Whenever the motor protector or discharge sensor shuts down a compressor, the internal compressor contacts open for 30 minutes so motor/scroll temperatures can dissipate before the system is permitted to restart. | 188 |
| SYS 1 HIGH MTR CURR SYS 2 HIGH MTR CURR | System Fault Code 17 – System High Motor Current (System Current Feedback option) | Condition present when CR1 (SYS 1) or CR2 (SYS 2) opens, causing 0 V to be read on the input (motor protector faulted or mechanical high pressure cutout open); only occurs when a system is not running. | Condition cleared and the system allowed to start when a 30 V signal is restored to the input by CR1 or CR2 closing. 3x per Table 15. | 150 |
| SYS 1 LOW SUPERHEAT SYS 2 LOW SUPERHEAT | System Fault Code 23 – Low Suction Superheat cutout (EEV mode only); also displayed as “SYS x LOW SUCT SHE AT” | Protects the compressors from liquid flowing back due to low suction superheat. Triggered when the suction superheat is lower than 2.0°F for 3 seconds, or when the LLSV is closed 10 times in 2 minutes due to low superheat. Ignored for the first 15 seconds of system run time; trips after the programmed trip time has passed. | Fault resets if the superheat rises above 2°F; lockout after three shutdowns in 90 minutes. 3x per Table 15. | 145 |
| SYS 1 SENSOR FAILURE SYS 2 SENSOR FAILURE | System Fault Code 24 – Sensor Failure cutout (EEV mode only) | Prevents the EEV from running when the sensors measuring superheat are not functioning properly; shuts the system down if either the suction temperature or suction pressure sensors read out of range high or low for 3 seconds. Ignored for the first 15 seconds of system run time. | Locks out on the first fault; will not automatically restart. 1x per Table 15. | 145 |
| LOW EVAPORATOR TEMPERATURE (R407c ONLY – N/A HP HEATING MODE) | System Fault Code 19 – Low Evaporator Temperature (R407c only; not applicable in heat pump heating mode) | 3x: automatically restarts on the first and second fault with a lockout on the third fault in 90 minutes. | 144 | |
| DISCHARGE INHIBIT (HEAT PUMP HEATING MODE ONLY) | System Fault Code 25 – Discharge Inhibit (heat pump heating mode only) | 3x: automatically restarts on the first and second fault with a lockout on the third fault in 90 minutes. | 144 |
System Inhibits
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| SYS 1 MP/HPCO INHIB SYS 2 MP/HPCO INHIB | System Inhibit Code 26 – Motor Protector / High Pressure Cutout Inhibit | Prevents the system from trying to start when a motor protector is faulted or the mechanical high pressure cutout is open; condition present when CR1 (SYS 1) or CR2 (SYS 2) opens, causing 0 VDC to be read on the input. Only occurs when a system is not running; also displayed during the 30-minute timeout after a motor protector/discharge-sensor shutdown while the internal compressor contacts are open or the HPCO is open. | Compressors will not be permitted to start while displayed; condition cleared and restart allowed when a 30 VDC signal is restored to the input by CR1 or CR2 closing (contacts close after the 30-minute timeout). Auto per Table 15. | 188 |
| SYS 1 ATV SUCT PRESS SYS 2 ATV SUCT PRESS | System Inhibit Code 30 – Anti-Vacuum Low Pressure Cutout | If the system is running, it shuts down when the suction pressure falls below the anti-vacuum low pressure cutout for longer than the programmed Anti-Vacuum Delay Time; if the system is not running, it is inhibited from starting while the suction pressure is below the anti-vacuum low pressure cutout. | Standard system fault: lockout after 3 occurrences in 90 minutes; the fault cannot be reset until the fault condition is resolved. 3x per Table 15. | 143 |
| LEAVING CHILLED LIQUID TEMPERATURE SENSOR FAULT | System Inhibit Code 32 – Leaving Chilled Liquid Temperature Sensor Fault | 3x: automatically restarts on the first and second fault with a lockout on the third fault in 90 minutes. | 144 | |
| SYS 1 LOW DS CH SHE AT SYS 2 LOW DS CH SHE AT | System Inhibit Code 33 – Low Discharge Superheat | System Discharge Superheat drops below 18°F; trips after 5 minutes have passed. Only active when Discharge Temperature Sensors are enabled. | Fault resets if the superheat rises above 18°F; will lockout after three shutdowns in 90 minutes. Listed as Auto in Table 15 (allows restart once meeting the required conditions). | 145 |
Real Time Error Numbers
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| 0 | All ok | No error present. | 175 | |
| 1 | Datum type ok test failed | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 2 | English text too long | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 3 | Floating point exception | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 4 | Get packet failed | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 5 | Get type failed | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 6 | Invalid unit conversion | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 7 | Invalid hardware selection | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 8 | Real time fault | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 9 | Spanish text too long | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 10 | Thread exited | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 11 | Thread failed | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 12 | Thread stalled | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 13 | IO board reset | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 14 | BRAM invalid | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 | |
| 15 | BACnet setup failed | Reset via the REAL TIME ERROR screen (set RESET = 1/YES); reboot required (cycle power) after settings are changed. | 175 |
Flash Card Update
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| FLASH CARD UPDATE ERROR XXXXX | Flash card operating-software update error (error code shown as XXXXX) | An error occurred during the flash card update: the incorrect Flash Card was used, incorrect chiller software was used, the Flash Card is defective, or the IPU and I/O combo board is bad. | The original program will still be active and no reboot will occur; ensure the correct Flash Card was used. | 168 |
From EBMPapst Fan Electronic Module Replacement Guide SI0601
Original: docs.johnsoncontrols.com
Verify Fan Operation and Programming
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| LED on the electronic module flashes 11 times | The initialization process failed. | Disconnect power from the electronic module for at least one minute. After one minute, repeat the power-up and initialization steps (apply power, allow the automatic initialization process to run without interrupting or disconnecting power, monitor the LED). If the fan module fails a second time, a fan recalibration is required: contact Product Technical Support for special files to load into the fan module and perform the FAN MODULE RECALIBRATION PROCEDURES. | 4 |
From YLAA, YVAA, YVFA ABB AYK550 VFD Drive Not Responding Fault SI0466
Original: docs.johnsoncontrols.com
ABB AYK550 VFD Drive Not Responding Fault
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Drive not responding | Fault appearing on the screen for the ABB AYK550 Variable Frequency Drive (VFD) installed on Air-Cooled Chillers (YLAA, YVAA, YVFA). | This fault may be due to the heatsink fan being jammed or failure within the VFD. If the drive still shows the fault after the heatsink fan check, the drive has other damage and must be replaced. | Prior to condemning the VFD, confirm the heatsink fan has not failed. The heatsink fan is located on the back side of the VFD enclosure behind the rain hood assembly. Make sure unit is deenergized and locked out prior to performing steps following JCI procedures for working on electrical equipment. Loosen and remove the six screws holding the rain hood in place (retain screws and foam seal for reassembly) and remove the rain hood assembly. At the top of the VFD, pull the lever on the plastic fan grill guard so the grill guard and fan rotate and lift out of the VFD (do not remove too far, as the wire is attached inside the VFD). Follow the fan wire and disconnect it where it connects into the VFD. Energize the unit and follow procedures within the chiller controls panel to power the VFD. If the drive powers up normally, showing voltage, amperage, and Hz on the screen, then the fan has failed and requires replacement — do not continue to run the VFD with the cooling fan disconnected as the VFD will overheat and fault. Review the nameplate label on the side of the ABB VFD for part number and voltage to determine the correct replacement fan: 026-52721-000 for R1 & R2 575V frame VFD, 026-52722-000 for R2 & R3 frame VFD, or 026-52723-000 for R4 frame VFD. Remove the faulty cooling fan from the fan grill guard (do not damage retaining clips), connect wiring to the new cooling fan, install grill guard with fan into the VFD, and install the rain hood with the six previously removed screws, verifying the foam seal is in good condition and properly compressed. If the drive still shows the "Drive not responding" fault, the drive has other damage and must be replaced. | 1 |
From YVAA, YVFA, YVAM, YLAA EBMPapst Variable Speed Fan Troubleshooting Guide SI0487
Original: docs.johnsoncontrols.com
Fault Code (Red LED color)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Phase failure (Red LED, 1 pulse) | Automatic restart once phase failure is corrected | 4 | ||
| Power module overheated (Red LED, 3 pulses) | Power cycle required | 4 | ||
| Internal communications error between primary/secondary controller (Red LED, 4 pulses) | Primary = electronics, Secondary = motor | Power cycle required | 4 | |
| Motor overheated (Red LED, 6 pulses) | Power cycle required | 4 | ||
| Hall sensor error (Red LED, 7 pulses) | Power cycle required | 4 | ||
| Motor blocked (Red LED, 8 pulses) | Automatic restart after blockage is cleared | 4 | ||
| Speed limit exceeded (Red LED, 9 pulses) | Automatic restart | 4 | ||
| Rotor position sensor calibration error (Red LED, 11 pulses) | Power cycle required | 4 | ||
| DC-link undervoltage (Red LED, 13 pulses) | Automatic restart after undervoltage is cleared | 4 |
Fault Code (Yellow LED color)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Current limitation in action (Yellow LED, 1 pulse) | Current limited to prevent damage of the electronics | 4 | ||
| Line impedance too high (Yellow LED, 2 pulses) | DC link voltage is instable | 4 | ||
| Power limiter in action (Yellow LED, 3 pulses) | Derating is active | 4 | ||
| Output stage temperature high (Yellow LED, 4 pulses) | Temperature > 105°C | 4 | ||
| Motor temperature high (Yellow LED, 5 pulses) | Temperature > 130°C | 4 | ||
| Temperature inside electronics high (Yellow LED, 6 pulses) | Temperature > 105°C | 4 | ||
| DC-link voltage low (Yellow LED, 7 pulses) | DC-link < 460 V | 4 | ||
| Calibration of rotor position (Yellow LED, 9 pulses) | Calibration of rotor position sensor in progress | 4 | ||
| Cable break at analog or PWM input for analog set value (Yellow LED, 11 pulses) | Check wiring. NOTE: This fault code may be present if the command signal to the motor is 0%. Increase command signal to check if wiring issue. | 4 | ||
| DC-link voltage high (Yellow LED, 13 pulses) | DC-link > 850 V | 4 | ||
| Line-voltage high (Yellow LED, 15 pulses) | U1_peak > 850 VDC | 4 | ||
| Shedding function active (Yellow LED, 16 pulses) | Shedding function is active and fan is blocked | 4 |
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