91 fault, warning and safety-shutdown messages documented by the manufacturer for the YORK YCAV, from 8 manuals. A message in bold has a page of its own: what it means, why it appears, what to check and how the unit restarts — from the manual that documents it. The others link to their row in the manual, with the page it was taken from.
VSD safeties (faults)
| Message on the display | What it means | Manual |
|---|---|---|
| UNIT PRECHARGE - LOW DC BUS VOLTAGE 4-compressor units: SYS X PRECHARGE - LOW DC BUS VOLT | Software fault. Unit fault on 2- and 3-compressor chillers; system fault (Sys 1/3 or 2/4) on… | 201.21-NM1 p.209 |
| UNIT PRECHARGE - DC BUS VOLTAGE IMBALANCE 4-compressor units: SYS X PRECHARGE-BUS VOLT IMBAL | Software fault. Unit fault on 2- and 3-compressor chillers; system 1/3 or 2/4 fault on 4-compressor… | 201.21-NM1 p.209 |
| UNIT HIGH DC BUS VOLTAGE 4-compressor units: SYS X HIGH DC BUS VOLTAGE | Hardware fault. Unit fault on 2- and 3-compressor chillers; system 1/3 or 2/4 fault on 4-compressor… | 201.21-NM1 p.209 |
| UNIT LOW DC BUS VOLTAGE 4-compressor units: SYS X LOW DC BUS VOLTAGE | Software fault. Unit fault on 2- and 3-compressor chillers; system fault (1/3 or 2/4) on… | 201.21-NM1 p.210 |
| UNIT DC BUS VOLTAGE IMBALANCE 4-compressor units: SYS X DC BUS VOLTAGE IMBALANCE | Software fault. Unit fault on 2- and 3-compressor chillers; system 1/3 or 2/4 fault on 4-compressor… | 201.21-NM1 p.210 |
| SYS X HIGH MOTOR CURRENT | Hardware fault; individual system/compressor fault for all units. Immediate shutdown. | 201.21-NM1 p.210 |
| SYS X MOTOR CURRENT OVERLOAD | Software fault; individual system/compressor fault for all systems. Controlled ramped shutdown;… | 201.21-NM1 p.211 |
| UNIT MOTOR CURRENT OVERLOAD | Hardware fault; unit fault that locks out all systems on the first fault. Immediate shutdown. | 201.21-NM1 p.211 |
| SYS X GATE DRIVER | Hardware fault; system fault for all units. Immediate shutdown. | 201.21-NM1 p.211 |
| SYS X HIGH VSD BASEPLATE TEMP | Software fault; system fault for all units. Controlled ramped shutdown. | 201.21-NM1 p.212 |
| UNIT HIGH VSD INTERNAL AMBIENT TEMP | Software fault; unit fault for all units. Controlled ramped shutdown; does not cause a lockout. | 201.21-NM1 p.212 |
| UNIT SINGLE PHASE INPUT VOLTAGE 4-compressor units: SYS X SINGLE PHASE INPUT VOLTS | Hardware fault. Unit fault on 2- and 3-compressor units; system fault 1/3 or 2/4 on 4-compressor… | 201.21-NM1 p.212 |
| UNIT VSD LOGIC BOARD POWER SUPPLY | Hardware fault; unit fault for all units. Immediate shutdown. | 201.21-NM1 p.213 |
| SYS X VSD RUN RELAY | Software fault. System fault on 2-compressor units; combined as a 1/3 or 2/4 system fault on 3- and… | 201.21-NM1 p.213 |
| UNIT VSD LOGIC BOARD FAILURE | Software fault; unit fault for all units. All systems shut down immediately if running. | 201.21-NM1 p.213 |
| UNIT VSD CT PLUG FAULT | Hardware fault; unit fault for all units. Immediate shutdown, or start inhibited if off. | 201.21-NM1 p.213 |
| UNIT PRECHARGE - LOW DC BUS VOLTAGE SYS X PRECHARGE - LOW DC BUS VOLT | Pre-charge Low DC Bus Voltage (Software) Fault. DC bus voltage did not reach at least 50 VDC within… | 201.21-NM3 p.246 |
| UNIT PRECHARGE - DC BUS VOLTAGE IMBALANCE SYS X PRECHARGE-BUS VOLT IMBAL | Pre-charge DC Bus Voltage Imbalance (Software) Fault. During the pre-charge interval the 1/2 DC bus… | 201.21-NM3 p.246 |
| UNIT HIGH DC BUS VOLTAGE SYS X HIGH DC BUS VOLTAGE | High DC Bus Voltage (Hardware) Fault. Trip level determined by hardware on the VSD Logic Board at… | 201.21-NM3 p.246 |
| UNIT LOW DC BUS VOLTAGE SYS X LOW DC BUS VOLTAGE | Low DC Bus Voltage (Software) Fault. Trip level set at 500 VDC; unit/system faults and shuts down… | 201.21-NM3 p.247 |
| UNIT DC BUS VOLTAGE IMBALANCE SYS X DC BUS VOLTAGE IMBALANCE | DC Bus Voltage Imbalance (Software) Fault. The 1/2 DC bus voltage magnitude must remain within… | 201.21-NM3 p.247 |
| UNIT SINGLE PHASE INPUT VOLTAGE SYS X SINGLE PHASE INPUT VOLTS | Single Phase Input (Hardware) Fault. The VSD's SCR Trigger Control board checks the three-phase… | 201.21-NM3 p.249 |
Unit warnings
| Message on the display | What it means | Manual |
|---|---|---|
| UNIT WARNING: !! LOW BATTERY !! CHECK SETPOINTS/PROGRAM/OPTIONS/TIME | Displayed indefinitely when the RTC battery voltage is low; can only occur at unit power-up. | 201.21-NM1 p.215 |
| Flash Card Update Error | Error message displayed if an error occurs during a program/database update from the SD flash card;… | 201.21-NM1 p.217 |
| UNIT WARNING: INVALID NUMBER OF COMPRESSORS SELECTED | Start-up of the unit is inhibited; warning displayed indefinitely in the Status display. | 201.21-NM1 p.218 |
| UNIT WARNING: INVALID SERIAL NUMBER ENTER UNIT SERIAL NUMBER | May mean the chiller has lost important factory programmed information; an Optimized IPLV chiller… | 201.21-NM1 p.218 |
| UNIT WARNING: OPTIMIZED EFFICIENCY DISABLED - CONTACT YORK REPRESENTATIVE | An optimized (High IPLV) chiller is programmed for standard control. | 201.21-NM1 p.218 |
Unit safeties
| Message on the display | What it means | Manual |
|---|---|---|
| UNIT LOW AMBIENT TEMP | Unit fault - controlled ramped shutdown; cannot cause a lockout. Occurs only if the Low Ambient… | 201.21-NM1 p.219 |
| UNIT LOW LEAVING CHILLED LIQUID TEMP | Unit fault - controlled ramped shutdown; cannot cause a lockout. Helps protect the chiller from an… | 201.21-NM1 p.220 |
| UNIT VSD COMMUNICATIONS FAILURE | Unit fault - controlled ramped shutdown while operating; prevents the unit from trying to run if… | 201.21-NM1 p.220 |
System safeties: Faults
| Message on the display | What it means | Manual |
|---|---|---|
| SYS X HIGH DISCHARGE PRESSURE | Software fault - controlled ramped shutdown. X indicates the system; YYYYYYYY indicates FAULT… | 201.21-NM1 p.221 |
| SYS X HPCO FAULT | Mechanical (hardware) high pressure cutout - protects the system from dangerously high discharge… | 201.21-NM1 p.222 |
| SYS X LOW SUCTION PRESSURE | Software fault - controlled ramped shutdown. Secondary back-up for the flow switch; protects… | 201.21-NM1 p.222 |
| SYS X LOW MOTOR CURRENT | Controlled ramped shutdown when the microprocessor detects the absence of motor current, usually… | 201.21-NM1 p.222 |
| SYS X HIGH DIFF OIL PRESSURE | Controlled ramped shutdown; protects the compressor from low oil flow and insufficient lubrication,… | 201.21-NM1 p.223 |
| SYS X LOW DIFF OIL PRESSURE | Controlled ramped shutdown; protects the compressor from low oil flow and insufficient lubrication;… | 201.21-NM1 p.223 |
| SYS X HIGH DSCHARGE TEMP | Controlled ramped shutdown; protects the motor and compressor from overheating. | 201.21-NM1 p.223 |
| SYS X HIGH OIL TEMP | Controlled ramped shutdown; protects the compressor from insufficient lubrication. | 201.21-NM1 p.224 |
| SYS X LOW SUCTION SUPERHEAT | Controlled ramped shutdown; helps protect the compressor from liquid floodback due to low suction… | 201.21-NM1 p.224 |
| SYS X LOW DISCHARGE SUPERHEAT | Controlled ramped shutdown; helps protect the compressor primarily from liquid floodback through… | 201.21-NM1 p.224 |
| SYS X SENSOR FAILURE: | Prevents the system from running when a critical sensor (transducer, level sensor, or motor winding… | 201.21-NM1 p.225 |
| SYS X HIGH MOTOR TEMP | Controlled ramped shutdown; prevents a compressor from running when its motor temperature is too… | 201.21-NM1 p.225 |
| SYS X HIGH FLASH TANK LEVEL | Prevents the system from running when the liquid level in the flash tank is too high. Ignored for… | 201.21-NM1 p.226 |
| SYS X CONTROL VOLTAGE | Alerts the operator that the 115V AC control voltage to one of the systems is missing; the affected… | 201.21-NM1 p.226 |
Troubleshooting guide
| Message on the display | What it means | Manual |
|---|---|---|
| Chiller Fault: LOW AMBIENT TEMPERATURE | Ambient temperature is lower than the programmed operating limit. Ambient Sensor is defective. | 201.21-NM1 p.306 |
| Chiller Fault: HIGH AMBIENT TEMPERATURE | Ambient Temperature is above the maximum operating limit. Ambient Sensor is defective. | 201.21-NM1 p.306 |
| Chiller Fault: LOW LEAVING CHILLED LIQUID | Leaving chilled liquid temperature drops faster than the unit can unload (restricted flow; rapid… | 201.21-NM1 p.306 |
| System Fault: CONTROL VOLTAGE | System Fuse is blown. | 201.21-NM1 p.306 |
| System Fault: HIGH OIL TEMPERATURE | Oil Temperature Sensor is defective. Condenser Fans NOT operating or running backwards. Coils dirty. | 201.21-NM1 p.306 |
| System Fault: HIGH DISCHARGE PRESSURE | Coils dirty. Coils are damaged. Fans NOT operating. System is overcharged. | 201.21-NM1 p.307 |
| System Fault: HIGH DISCHARGE TEMPERATURE | Discharge Temperature Sensor is defective. Condenser Fans NOT operating or are running backwards.… | 201.21-NM1 p.307 |
| System Fault: HIGH MOTOR TEMPERATURE | High Motor temperature input from one of the sensors. Refrigerant charge low. Excess charge in… | 201.21-NM1 p.307 |
| System Fault: LOW SUCTION PRESSURE | Low charge. Transducer reads incorrectly. Suction Temp. Sensor reads incorrectly. Low flow. Feed or… | 201.21-NM1 p.307 |
| VSD Fault: High Baseplate Temperature | Coolant level low. Glycol Pump is defective. VSD Board is defective. IBGT Module is defective. | 201.21-NM1 p.308 |
| VSD Fault: Low DC Bus Voltage | SCR / Diode Module is defective. SCR Trigger Board is defective. | 201.21-NM1 p.308 |
| 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… | 201.21-NM3 p.337 |
| Line Fuse Blows. | SCR Diode Module is defective. IGBT Module is defective. VSD Logic Board is defective. SCR Trigger… | 201.21-NM3 p.337 |
| System Fault: DISCHARGE PRESSURE LIMITING | Discharge Transducer is defective. Ambient Temp. very high. Fans NOT operating. Remote or local… | 201.21-NM3 p.338 |
| System Fault: MOTOR CURRENT LIMITING | High motor current has activated current limiting Ambient temperature is high, Remote or panel… | 201.21-NM3 p.339 |
Flash card update error XXXXX
| Message on the display | What it means | Manual |
|---|---|---|
| Error code 10 | Flash card not found. | 201.21-NM3 p.254 |
| Error code 11 | SOFTWARE.BIN file not found | 201.21-NM3 p.254 |
| Error code 14 | SOFTWARE.BIN file larger than expected. | 201.21-NM3 p.254 |
| Error code 15 | RAM to IPU Flash transfer of DATABASE.BIN failed. | 201.21-NM3 p.254 |
| Error code 16 | RAM to IPU Flash transfer of SOFTWARE.BIN failed. | 201.21-NM3 p.254 |
| Error code 17 | Could not allocate sufficient memory to read or write file. | 201.21-NM3 p.254 |
| Error code 99 | Internal software error. | 201.21-NM3 p.254 |
UNIT WARNINGS
| Message on the display | What it means | Manual |
|---|---|---|
| UNIT WARNING: INVALID NUMBER OF COMPRESSSORS SELECTED | No or multiple "Number of Compressors Select" jumpers installed | 201.21-NM2 p.183 |
| UNIT WARNING: OPTIMIZED EFFICIENCY DISABLED - CONTACT YORK REPRESENATIVE | Optimized chiller programmed for standard control | 201.21-NM2 p.183 |
System Safeties (Faults)
| Message on the display | What it means | Manual |
|---|---|---|
| SYS X HIGH DISCHARGE TEMP | Protects the motor and compressor from overheating. YYYYYYY indicates a "FAULT" condition or… | 201.21-NM4 p.218 |
Flash Card Update Error Codes
| Message on the display | What it means | Manual |
|---|---|---|
| FLASH CARD UPDATE ERROR 10 | Error message displayed if an error occurs during the flash card program update; XXXXX is the Error… | 201.21-NM4 p.212 |
| FLASH CARD UPDATE ERROR 11 | Error message displayed if an error occurs during the flash card program update; XXXXX is the Error… | 201.21-NM4 p.212 |
| FLASH CARD UPDATE ERROR 14 | Error message displayed if an error occurs during the flash card program update; XXXXX is the Error… | 201.21-NM4 p.212 |
| FLASH CARD UPDATE ERROR 15 | Error message displayed if an error occurs during the flash card program update; XXXXX is the Error… | 201.21-NM4 p.212 |
| FLASH CARD UPDATE ERROR 16 | Error message displayed if an error occurs during the flash card program update; XXXXX is the Error… | 201.21-NM4 p.212 |
| FLASH CARD UPDATE ERROR 17 | Error message displayed if an error occurs during the flash card program update; XXXXX is the Error… | 201.21-NM4 p.212 |
| FLASH CARD UPDATE ERROR 99 | Error message displayed if an error occurs during the flash card program update; XXXXX is the Error… | 201.21-NM4 p.212 |
LOW SUCTION PRESSURE FAULTS
| Message on the display | What it means | Manual |
|---|---|---|
| LOW SUCTION PRESSURE FAULTS CAUSED BY LOW FLOW | Low suction pressure fault caused by evaporator flow near or below the minimum allowed. | SI0219 p.2 |
| LOW SUCTION PRESSURE FAULTS CAUSED BY LOW SUBCOOLING | Low suction pressure fault caused by low refrigerant charge or non-condensables in the system. | SI0219 p.2 |
| LOW SUCTION PRESSURE FAULTS CAUSED BY AN INCORRECT TRANSDUCER OUTPUT | Low suction pressure fault caused by an incorrect suction pressure transducer output. | SI0219 p.3 |
| LOW SUCTION PRESSURE FAULTS CAUSED BY A DEFECTIVE FEED OR DRAIN VALVE | Low suction pressure fault caused by a defective feed valve or drain valve. | SI0219 p.3 |
| LOW SUCTION PRESSURE FAULTS CAUSED BY AN INCORRECT LEVEL SENSOR OUTPUT | Low suction pressure fault caused by a level sensor reading higher than the actual flash tank level. | SI0219 p.4 |
HIGH FLASH TANK FAULTS
| Message on the display | What it means | Manual |
|---|---|---|
| HIGH FLASH TANK FAULTS CAUSED BY INCORRECT LEVEL SENSOR OUTPUTS | High flash tank level fault caused by an incorrect level sensor output. | SI0219 p.5 |
Faults
| Message on the display | What it means | Manual |
|---|---|---|
| Low Differential Oil Pressure Cutout | Safety cutout. | SI0617 p.2 |
SYSTEM FAULTS
| Message on the display | What it means | Manual |
|---|---|---|
| Low Suction Superheat Fault | The Low Suction Superheat Cutout is to protect the compressor from liquid flood back due to low… | SI0541 p.2 |
Compressor Shutdown Control
| Message on the display | What it means | Manual |
|---|---|---|
| Low Ambient Temp | The Low Ambient Temp fault is changed to perform a soft ramped shutdown if soft shutdown is enabled. | SI0541 p.4 |
| High Ambient Temp | Ramped: Soft Shutdown Disabled Soft Ramped: Soft Shutdown Enabled | SI0616 p.2 |
| High Discharge Pressure | Ramped: Soft Shutdown Disabled Soft Ramped: Soft Shutdown Enabled AND Discharge Pressure Cutout <… | SI0616 p.2 |
| High Oil Temp | Ramped: Soft Shutdown Disabled Soft Ramped: Soft Shutdown Enabled | SI0616 p.2 |
| High Flash Tank Level | Ramped: Soft Shutdown Disabled Soft Ramped: Soft Shutdown Enabled Turn off economizer solenoid… | SI0616 p.2 |
Faults and Warnings
| Message on the display | What it means | Manual |
|---|---|---|
| High Discharge Pressure Cutout (Software) | When using software build -225 or -AGR, a system will shut down when discharge pressure rises above… | SI0616 p.2 |
High Oil Temperature Cutout
| Message on the display | What it means | Manual |
|---|---|---|
| High Oil Temperature Cutout | The High Oil Temperature Cutout fault will clear and be disabled when Oil Temp Sensor is Disabled. | SI0616 p.4 |
31 of 91 messages have a page of their own. Other documentation for this model: installation · parts lists · service bulletins · specifications · wiring diagrams. All YORK models: YORK manuals.