| Document type | Installation Guide |
|---|---|
| Document number | 201.28-NM1.1.EN.GB |
| Equipment | YVAA Style A |
| Brand | YORK |
| File size | 6.9 MB |
Fault codes in this document
Commissioning
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Sys2 - single phase input Volts | Fault reported by the unit; the unit does not start. | Power-on sequence reversed on YVAA0373/0375/0413/0443/0483/0490/0500/0523 units (independent circuit breaker/disconnect switches in each conduit of Sys1 and Sys2): Sys1 powered before Sys2. | Ensure that the Sys2 power is on first and then Sys1 by closing the corresponding circuit breaker or disconnect switch. | 89 |
Unit Warnings
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| UNIT WARNING: !! LOW BATTERY !! CHECK SETPOINTS/PROGRAM/OPTIONS/TIME | Low RTC battery condition detected at micropanel power-up; warning displayed indefinitely. Warnings are not logged to the history buffer; message is displayed when the STATUS key is pressed. | RTC battery voltage determined to be low when checked at unit power-up. | All programmed setpoints, program values, time, schedule, and history buffers will have been lost and reset to default values. Unit is prevented from running until the MANUAL OVERRIDE key is pressed (anti-recycle timers then set to the programmed default anti-recycle time to allow the operator time to check setpoints, program values, etc.). Replace the battery as soon as possible; if a low battery is detected and not replaced, the programmed values will all be lost and the unit will be prevented from running on the next power interruption. | 102 |
| UNIT WARNING: INVALID NUMBER OF COMPRESSORS SELECTED | Warning displayed indefinitely after the VSD has been initialized. | No jumpers installed or more than 1 jumper installed ("Number of Compressors Select" message displayed). | To clear this warning, both the control panel and VSD control voltage must be turned OFF and the jumpers correctly installed in the VSD wiring harness. Jumpers are factory installed in the wire harness plug and should not require changes. | 111 |
| UNIT WARNING: INVALID SERIAL NUMBER ENTER UNIT SERIAL NUMBER | The appearance of this message may mean the chiller has lost important factory programmed information; the serial number and other important data may need to be reprogrammed. | Immediately contact Johnson Controls Product Technical Support. The serial number can be entered using the SERVICE key (date and time must be set on the chiller before programming; factory-provided password required). This status message can be bypassed to view additional messages under the STATUS key by pressing the STATUS key repeatedly. | 111 |
Unit safeties
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| UNIT YYYYYYYY HIGH AMBIENT TEMP | Unit safety shutdown on high ambient temperature (auto-reset unit fault; YYYYYYYY indicates FAULT condition). | Ambient temperature rises above 55°C (131°F). | Controlled ramped shutdown. Restart will automatically occur, if demand allows, when temperature falls 1.1°C (2°F) below the cutout (53.9°C [129°F]). This fault cannot cause a lockout. Message present only while ambient temperature is causing the fault condition. Unit also inhibited from starting any time the temperature is above 53.9°C (129°F). | 112 |
| UNIT YYYYYYYY LOW AMBIENT TEMP | Unit safety shutdown on low ambient temperature (auto-reset unit fault; YYYYYYYY indicates FAULT condition). | Ambient temperature falls below the programmable Low Ambient Temp Cutout. This fault only occurs if the Low Ambient Cutout is "ENABLED" under the OPTIONS key. | Controlled ramped shutdown. Restart can occur, if demand allows, when temperature rises 1.1°C (2°F) above the cutout. This fault cannot cause a lockout. Unit also inhibited from starting any time the temperature is below the cutout plus 1.1°C (2°F). | 112 |
| UNIT YYYYYYYY LOW LEAVING CHILLED LIQUID TEMP | Protects the chiller from an evaporator freeze-up should the chilled liquid temp drop below the freeze point (auto-reset unit fault; YYYYYYYY indicates FAULT condition). | Leaving chilled liquid temperature (water or brine) drops below the programmable cutout point. Situation could occur under low flow conditions or if the Micro Panel setpoint values are incorrectly programmed. | Fault and controlled ramped shutdown. Restart can occur, if demand allows, when chilled liquid temperature rises 2.2°C (4°F) above the cutout. This fault cannot cause a lockout. Unit inhibited from starting any time the chilled liquid temperature is below the cutout plus 2.2°C (4°F). | 112 |
| UNIT YYYYYYYY VSD COMMUNICATIONS FAILURE | Prevents the unit from trying to run if the Chiller Control Board never initializes communications with the VSD Logic Board; shuts the unit down if communications are lost while the chiller is operating. | On power-up, no reply from the VSD Logic Board within 8 seconds; during normal operation, no valid response to messages received for 8 seconds. | All compressors shut down on a Comms fault with a controlled ramped shutdown. Unit inhibited from starting until communications is established. Fault automatically resets when the Chiller Control Board receives a valid response from the VSD for a data request. Note: if any 3 VSD unit faults occur within 90 minutes, the unit will be locked out on the last fault; a VSD lockout requires a manual reset using the system switches — both system switches must be cycled OFF and ON to clear. | 113 |
System safeties (faults)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| SYS X YYYYYYYY HIGH DISCHARGE PRESSURE | Software high discharge pressure cutout. X indicates the system; YYYYYYYY indicates the system is in a FAULT condition (restarts when the 120 second anti-recycle timer times out) or LOCKOUT (will not restart until the operator clears the fault using the keypad). | Discharge pressure rises above 22.4 barg (325 psig) for 0.5 seconds. | Controlled ramped shutdown. System allowed to restart when the discharge pressure falls to 20.3 barg (295 psig); system also inhibited from starting if the pressure is above 20.3 barg (295 psig). Lockout occurs on the third fault in 90 minutes; lockout cleared by cycling the respective system switch OFF and ON. | 113 |
| SYS X YYYYYYYY HPCO FAULT | Mechanical (hardware) High Pressure Cutout protecting the system from dangerously high discharge pressure. X indicates the system; YYYYYYYY indicates FAULT or LOCKOUT. | Mechanical high pressure cutout contacts open — cutout opens at 23.2 barg ± 0.55 barg (337 psig ± 8 psig) and closes at 17.4 barg ± 0.69 barg (252 psig ± 10 psig). Wired in series with the VSD Run Signal and only checked when the system is running; fault occurs immediately and does not wait the 3 seconds typical of most system faults. | Immediate shutdown. Restart when the 120 second anti-recycle timer times out, or LOCKOUT until the operator clears the fault using the keypad. | 114 |
| SYS X YYYYYYYY LOW SUCTION PRESSURE | Programmable Low Suction Pressure Cutout — protects the chiller from an evaporator freeze-up if the system attempts to run with a low refrigerant charge. X indicates the system number. | Suction pressure falls below the programmable Suction Pressure Cutout. Cutout is ignored at system start for the programmed Suction Pressure Startup Bypass Time, then linearly ramped from 10% to 100% of the programmed Suction Pressure Cutout; shutdown occurs if the suction pressure falls below the ramped cutout during the ramp or below the programmed cutout after the ramp. | System shuts down. Causes a lockout on the third fault in 90 minutes; lockout cleared by cycling the respective system switch OFF and ON. | 114 |
| SYS X YYYYYYYY LOW SUCT PRES SMART FREEZE | Low suction pressure smart freeze safety (R-134a and R-513A refrigeration systems). X indicates the system number. | Suction Pressure is below the programmable Suction Pressure Override Threshold (Suction Pressure Cutout in psig + 1.7 psig) longer than the programmable Smart Freeze Timer. | Safety fault is released when the Suction Pressure >= Suction Pressure Override Threshold. Causes a lockout on the third fault in 90 minutes. | 114 |
| SYS X YYYYYYYY LOW MOTOR CURRENT | Motor Current Cutout — shuts the system down when the microprocessor detects the absence of motor current, usually indicating that a compressor is not running. X indicates the system; YYYYYYYY indicates FAULT or LOCKOUT. | Motor current less than 10% FLA; safety is ignored for the first 10 seconds of operation. | Controlled ramped shutdown. Restart when the 120 second anti-recycle timer times out, or LOCKOUT until the operator clears the fault using the keypad. | 114 |
| SYS X YYYYYYYY HIGH DIFF OIL PRESSURE | Protects the compressor from low oil flow and insufficient lubrication, possibly from a dirty oil filter. X indicates the system; YYYYYYYY indicates FAULT or LOCKOUT. | Discharge to Oil Differential Pressure rises above the cutout of 4.48 barg (65 psid) — measures the pressure differential between discharge and oil pressure (pressure drop across the oil filter); safety ignored for the first 90 seconds of run time. | Controlled ramped shutdown. Restart when the 120 second anti-recycle timer times out, or LOCKOUT until the operator clears the fault using the keypad. | 114 |
| SYS X YYYYYYYY LOW DIFF OIL PRESSURE | Protects the compressor from low oil flow and insufficient lubrication; ensures the compressor is pumping sufficiently to push oil through the oil cooling circuit and internal compressor lubrication system. X indicates the system; YYYYYYYY indicates FAULT or LOCKOUT. | Differential between oil and suction pressure falls below the cutout. Safety ignored for the first 60 seconds of run time; thereafter the cutout is linearly ramped from 0 barg to 2.09 barg (0 psid to 30 psid) in 5 to 10 minutes based on ambient temperature (Table 15). A 30 second safety bypass below 50 Hz is employed during rampdown (needed when another compressor is being brought on and the running compressor is ramped down to 5 Hz) to prevent nuisance low oil differential trips. | Controlled ramped shutdown. Restart when the 120 second anti-recycle timer times out, or LOCKOUT until the operator clears the fault using the keypad. | 115 |
| SYS X YYYYYYYY HIGH DISCHARGE TEMP | Protects the motor and compressor from overheating. X indicates the system; YYYYYYYY indicates FAULT or LOCKOUT. | Discharge Temperature rises above 121°C (250°F); system also inhibited from starting if the discharge temperature is above 93°C (200°F). | Controlled ramped shutdown. Restart when the 120 second anti-recycle timer times out, or LOCKOUT until the operator clears the fault using the keypad. | 115 |
| Low discharge superheat cutout fault (display wording not printed in manual) | Helps protect the compressor from liquid floodback through the economizer line due to a high flashtank level, and from excessive oil in circulation due to excess oil charge in the system (entrained liquid refrigerant drops out once it enters the compressor). | Discharge superheat falls below 2.8°C (5.0°F) for 5 minutes. Safety is ignored for the first 10 minutes of operation if the system economizer feed valve is closed (0%) and for 5 minutes of operation if the economizer feed valve is open greater than 0%. | System shuts down. Restart when the 120 second anti-recycle timer times out, or LOCKOUT until the operator clears the fault using the keypad. | 115 |
| SYS X YYYYYYYY SENSOR FAILURE: ZZZZZZZZZZZZ | Prevents the system from running when a critical sensor (transducer, level sensor, or motor winding temp sensor) is not functioning correctly and reading out of range. X indicates the specific system; YYYYYYYY indicates FAULT (restarts when the fault clears) or LOCKOUT after 3 faults; ZZZZZZZZZZZ indicates the failed sensor. | Sensor failed or reading out of range (high or low); checked at startup and also during operation. Failed sensor indicated as SUCT PRESS, OIL PRESS, DSCH PRESS, or MOTOR TEMP X. Start inhibit sensor thresholds (Table 18): Suction Transducer 0.3 VDC to 4.7 VDC; Oil Transducer 0.3 VDC to 4.7 VDC; Discharge Transducer 0.3 VDC to 4.7 VDC; Motor Temp. Sensor 0°C (0ºF) to 116°C (240ºF). | Prevents the system from running at startup; faults and shuts down a system while in operation if a safety threshold is exceeded or a sensor reads out of range. Restarts when the fault clears, or LOCKOUT after 3 faults until the operator clears the fault using the keypad. The Unit Setup Mode allows a specific motor temperature sensor to be ignored if it fails. | 116 |
| SYS X YYYYYYYY HIGH MOTOR TEMP | Prevents a compressor from running when its motor temperature is too high. X indicates the system; YYYYYYYY indicates FAULT or LOCKOUT. | Any compressor motor temperature sensor rises above 121°C (250°F); system inhibited from starting if its motor temperature sensors indicate temperatures above 116°C (240°F). If any single temperature sensor is being ignored under the Unit Set-up Mode, that sensor is not utilized when evaluating motor temperature. | Fault and shutdown. Restart when the fault clears, or LOCKOUT until the operator clears the fault using the keypad. | 117 |
| SYS X YYYYYYYY CONTROL VOLTAGE | Alerts the operator that the 115 V AC Control voltage to one of the systems is missing. X indicates the system; YYYYYYYY indicates FAULT or LOCKOUT. | System fuse removed or blown. Safety will not shut down a system if the UNIT switch is OFF (which electrically removes the 115 V AC to all systems); only used to indicate a situation where a single system is missing the 115 V AC. | Affected system faults and shuts down immediately when the 115 V AC supply is lost. Will not cause a lockout; the system fault resets when power is returned. | 117 |
| EDUCTOR CLOG FAULT | Senses a loss of oil return to the compressor — the eductor clog detection safety monitors the temperature of the line between the eductor and the suction line. | Eductor line temperature greater than the saturated suction temperature plus 5.5°C (10°F): the clog timer (set at 600 seconds at start) is decremented one second for each second above the threshold and, if the temperature remains above the threshold for 600 seconds, counts to "0". Timer resets to 600 seconds whenever the eductor line temperature is below the threshold, preventing nuisance faults. | System shuts down and locks out. Whenever this fault occurs, the eductor filter should be changed. | 117 |
Real time error numbers for BAS, SC-EQ or E-Link communications card
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| 0 | ALL OK | 108 | ||
| 1 | DATUM TYPE OK TEST FAILED | 108 | ||
| 2 | ENGLISH TEXT TOO LONG | 108 | ||
| 3 | FLOATING POINT EXCEPTION | 108 | ||
| 4 | GET PACKET FAILED | 108 | ||
| 5 | GET TYPE FAILED | 108 | ||
| 6 | INVALID UNIT CONVERSION | 108 | ||
| 7 | INVALID HARDWARE SELECTION | 108 | ||
| 8 | REAL TIME FAULT | 108 | ||
| 9 | SPANISH TEXT TOO LONG | 108 | ||
| 10 | THREAD EXITED | 108 | ||
| 11 | THREAD FAILED | 108 | ||
| 12 | THREAD STALLED | 108 | ||
| 13 | IO BOARD RESET | 108 | ||
| 14 | RTC/BRAM INVALID | 108 | ||
| 15 | BACNET SETUP FAILED | 108 |
Flash card update error
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| 0 | Okay | 110 | ||
| 10 | Flash card not found. | Never reset or power down the chiller until the update is finished. Interrupting the flash update procedure can corrupt the program file and render the control board inoperative. | 110 | |
| 11 | SOFTWARE.ELF file not found | Never reset or power down the chiller until the update is finished. Interrupting the flash update procedure can corrupt the program file and render the control board inoperative. | 110 | |
| 14 | SOFTWARE.ELF file larger than expected. | Never reset or power down the chiller until the update is finished. Interrupting the flash update procedure can corrupt the program file and render the control board inoperative. | 110 | |
| 15 | RAM to IPU Flash transfer of DATABASE.ELF failed. | Never reset or power down the chiller until the update is finished. Interrupting the flash update procedure can corrupt the program file and render the control board inoperative. | 110 | |
| 16 | RAM to IPU Flash transfer of SOFTWARE.ELF failed. | Never reset or power down the chiller until the update is finished. Interrupting the flash update procedure can corrupt the program file and render the control board inoperative. | 110 | |
| 17 | Could not allocate sufficient memory to read or write file. | Never reset or power down the chiller until the update is finished. Interrupting the flash update procedure can corrupt the program file and render the control board inoperative. | 110 | |
| 99 | Internal software error. | Never reset or power down the chiller until the update is finished. Interrupting the flash update procedure can corrupt the program file and render the control board inoperative. | 110 |
Troubleshooting guide
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| NO DISPLAY ON CONTROL PANEL UNIT WILL NOT RUN. | Supply to the Panel is missing. High Voltage to the Chiller is missing. Line Fuse is blown. Chiller Control Board is defective. Display Board defective. | Check 1FU, 2FU, 4FU, 5FU 17FU, or 19FU. Check 2T or 10T Transformer. Check Fuses. Replace Chiller Control Board. Replace Display Board. | 170 | |
| LINE FUSE BLOWS. | SCR Diode Module is defective. IBGT Module is defective. VSD Logic Board is defective. SCR Trigger Board is defective. | Check SCR/Diode Module. Check IBGT Module. Replace VSD Logic Board. Replace SCR Trigger Board. | 170 | |
| CHILLER FAULT: LOW AMBIENT TEMPERATURE | Ambient temperature is lower than the programmed operating limit. Ambient Sensor is defective. | Check the programmed cutout and determine if it is programmed correctly. Check the panel against the thermometer reading of ambient temperature. | 170 | |
| CHILLER FAULT: HIGH AMBIENT TEMPERATURE | Ambient Temperature is above the maximum operating limit. Ambient Sensor is defective. | Check outside air temperature. Check the Panel Display against Thermometer reading of Ambient Temperature at the sensor. | 170 | |
| CHILLER FAULT: LOW LEAVING CHILLED LIQUID | Leaving chilled liquid temperature drops faster than the unit can unload. Water loop is too small. Flow is below minimum for chiller. Chilled Water Sensor is defective. | Check for restricted flow. Check for rapid flow changes. Check Sensor against Temp. Gauge in water line. Check Sensor for intermittent operation. Check Wiring for shorts or opens. | 170 | |
| SYSTEM FAULT: CONTROL VOLTAGE | System Fuse is blown. | Check respective system Fuse 20FU or 21FU. NOTE: Always remove power to the chiller and ensure the DC Bus voltage has bled off. | 170 | |
| SYSTEM FAULT: HIGH DISCHARGE PRESSURE | Coils dirty. Coils are damaged. Fans NOT operating. System is overcharged. | Check and clean coils. Comb out fins. Check fan fuses. Check fan rotation. Check fan motor/blade. Remove charge and check subcooling. | 171 | |
| SYSTEM FAULT: HIGH DISCHARGE TEMPERATURE | Discharge Temperature Sensor is defective. Condenser Fans NOT operating or are running backwards. Coils dirty. High Superheat. | Check Sensor. Check Fans. Check and clean Coils. Measure Superheat with gauges and thermocouple. Determine cause. | 171 | |
| SYSTEM FAULT: HIGH MOTOR TEMPERATURE | High Motor temperature input from one of the sensors. Refrigerant charge low. Excess charge in system, High discharge pressure. High Superheat. Motor Sensor reading incorrectly. Economizer Solenoid energized at low speeds. | Check subcooling. Check subcooling. Drain/Feed Valves NOT controlling. Isolate cause. Program panel to ignore a single sensor. Valve is leaking through. | 171 | |
| SYSTEM FAULT: LOW SUCTION PRESSURE | Low charge. Transducer reads incorrectly. Suction Temp. Sensor reads incorrectly. Low flow. Condenser Drain (Flash Tank Feed) Valve NOT operating. Condenser or Drain (Flash Tank Feed) Valve defective. | Check subcooling. Check transducer against a gauge. Check sensor against a thermocouple. Check flow. Check Feed and Drain Valve operation. Check superheat. Check Feed and Drain Valve operation. Check superheat. | 171 | |
| VSD FAULT: HIGH BASEPLATE TEMPERATURE | Coolant level low. Glycol Pump is defective. VSD Board is defective IBGT Module is defective. | Add coolant. Replace Glycol Pump. Replace VSD Logic Board. Check defective IGBT Module. | 172 | |
| VSD FAULT: LOW DC BUS VOLTAGE | SCR / Diode Module is defective. SCR Trigger Board is defective. | Check SCR / Diode Module. Check SCR Trigger Board. NOTE: Always remove power to the chiller and ensure the DC Bus voltage has bled off. | 172 |
Every row above cites the page of this document it came from, and each one is re-read against that page by an automatic check before publication.
Manufacturer document, published here as reference material for equipment we supply. The original lives at docs.johnsoncontrols.com. The rights holder may ask us to take it down — we will.