| Document type | Service Information Letter |
|---|---|
| Document number | SI0630 |
| Equipment | YVAA Style A |
| Brand | YORK |
| Revised | 2026-03-20 |
| File size | 0.9 MB |
Fault codes in this document
Errors (IPU3 Software Update)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| MORE THAN ONE FILE FOUND PRESS TO CONTINUE (x) | Error message displayed during IPU3 program update. | More than one *.bin file is on the selected device. | Displayed until the user presses the Enter key and returns to the software download display. | 5 |
| FILE NOT FOUND PRESS TO CONTINUE (x) | Error message displayed during IPU3 program update. | No *.bin file is on the selected device. | Displayed until the user presses the Enter key and returns to the software download display. | 5 |
| FILE NOT ABLE TO BE LOADED PRESS TO CONTINUE (x) | Error message displayed during IPU3 program update. | The *.bin file cannot be loaded to SPI flash, for example if the embedded checksum verification fails. | Displayed until the user presses the Enter key and returns to the software download display. | 5 |
| SELECTED DEVICE NOT FOUND PRESS TO CONTINUE (x) | Error message displayed during IPU3 program update. | The software update was attempted without a SD or USB device inserted. | Displayed until the user presses the Enter key and returns to the software download display. | 5 |
| FLASH ERROR XX PRESS TO CONTINUE (x) | Displayed if other internal errors occur during the software update. The Error Code displayed in the XX field is one of: 90 — FILE_BUFFER_APP_HEADER_READ 91 — CANNOT_CALCULATE_BUFFER_DATA_CRC 92 — BAD_FILE_BUFFER_DATA_CRC 93 — SFLASH_DEVICE_WRITE 94 — BAD_SFLASH_CRC 95 — APP_CODE_TOO_BIG 96 — SPI_FLASH_APP_NOT_PRESENT 97 — SPI_FLASH_READ_ERROR 98 — CANNOT_READ_DEVICE_CONFIGURATION | Other internal errors occurred during the software update. | Displayed until the user presses the Enter key. | 5 |
Unit Faults
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| 1 Low Ambient Temperature | Unit fault — Panel source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. | 16 | |
| 2 High Ambient Temperature | Unit fault — Panel source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. | 16 | |
| 3 Low Chilled Liquid Temperature | Unit fault — Panel source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. | 16 | |
| 4 VSD Initialization Failure | Unit fault — Panel source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. | 16 | |
| 5 Low RTC Battery Voltage | Unit fault — Panel source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. | 16 | |
| 6 Invalid Number of Compressors Selected | Unit fault — Panel source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. | 16 | |
| 7 VSD Communications Failure | Unit fault — Panel source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. | 16 | |
| 8 Pre-charge Low DC Bus Voltage | Unit fault — VSD source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. If any 3 (or more) VSD-related unit faults occur within 90 minutes, the unit triggers a lockout on the last fault in the range. A lockout requires manual reset, done via the System Switches button on the keypad or HMI. | 16 | |
| 9 Pre-charge DC Bus Voltage Imbalance | Unit fault — VSD source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. If any 3 (or more) VSD-related unit faults occur within 90 minutes, the unit triggers a lockout on the last fault in the range. A lockout requires manual reset, done via the System Switches button on the keypad or HMI. | 16 | |
| 10 High DC Bus Voltage | Unit fault — VSD source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. If any 3 (or more) VSD-related unit faults occur within 90 minutes, the unit triggers a lockout on the last fault in the range. A lockout requires manual reset, done via the System Switches button on the keypad or HMI. | 16 | |
| 11 Low DC Bus Voltage | Unit fault — VSD source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. If any 3 (or more) VSD-related unit faults occur within 90 minutes, the unit triggers a lockout on the last fault in the range. A lockout requires manual reset, done via the System Switches button on the keypad or HMI. | 16 | |
| 12 DC Bus Voltage Imbalance | Unit fault — VSD source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. If any 3 (or more) VSD-related unit faults occur within 90 minutes, the unit triggers a lockout on the last fault in the range. A lockout requires manual reset, done via the System Switches button on the keypad or HMI. | 16 | |
| 13 High VSD Ambient Temperature | Unit fault — VSD source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. If any 3 (or more) VSD-related unit faults occur within 90 minutes, the unit triggers a lockout on the last fault in the range. A lockout requires manual reset, done via the System Switches button on the keypad or HMI. | 16 | |
| 14 Single Phase Input | Unit fault — VSD source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. If any 3 (or more) VSD-related unit faults occur within 90 minutes, the unit triggers a lockout on the last fault in the range. A lockout requires manual reset, done via the System Switches button on the keypad or HMI. | 16 | |
| 15 VSD Power Supply Fault | Unit fault — VSD source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. If any 3 (or more) VSD-related unit faults occur within 90 minutes, the unit triggers a lockout on the last fault in the range. A lockout requires manual reset, done via the System Switches button on the keypad or HMI. | 16 | |
| 16 VSD Logic Board Fault | Unit fault — VSD source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. If any 3 (or more) VSD-related unit faults occur within 90 minutes, the unit triggers a lockout on the last fault in the range. A lockout requires manual reset, done via the System Switches button on the keypad or HMI. | 16 | |
| 17 Motor Current Overload (Hardware) | Unit fault — VSD source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. If any 3 (or more) VSD-related unit faults occur within 90 minutes, the unit triggers a lockout on the last fault in the range. A lockout requires manual reset, done via the System Switches button on the keypad or HMI. | 16 | |
| 18 CT Plug Fault | Unit fault — VSD source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. If any 3 (or more) VSD-related unit faults occur within 90 minutes, the unit triggers a lockout on the last fault in the range. A lockout requires manual reset, done via the System Switches button on the keypad or HMI. | 16 | |
| 19 High Harmonic Filter Temperature | Unit fault — Panel source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. | 16 | |
| 20 Evap Anti-Freeze Pump Fault | Unit fault — Panel source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. | 16 | |
| 21 SPARE | Unit fault — Panel source | 16 | ||
| 22 Replace RTC Battery | Unit fault — Panel source | If unit faults exceed a set threshold for 3 seconds, all running compressors are shut down. Unit faults are logged in the history buffer. Most unit faults are auto-reset; the unit can restart automatically after the fault condition is cleared. | 16 | |
| 23 SPARE | Unit fault — source not listed | 16 | ||
| 24 SPARE | Unit fault — source not listed | 16 | ||
| 25 SPARE | Unit fault — source not listed | 16 | ||
| 26 SPARE | Unit fault — source not listed | 16 |
System Faults
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| 27 High Discharge Pressure (Software) | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 16 | |
| 28 High Differential Oil Pressure | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 16 | |
| 29 Low Differential Oil Pressure | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 16 | |
| 30 Low Suction Pressure | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 16 | |
| 31 High Discharge Temperature | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 16 | |
| 32 SPARE | System fault — Panel source | 17 | ||
| 33 Eductor Clog Fault | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 34 Sensor Failure | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 35 Low Motor Current | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 36 High Motor Temperature | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 37 Pre-charge Low DC Bus Voltage | System fault — VSD source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 38 Pre-charge DC Bus Voltage Imbalance | System fault — VSD source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 39 High DC Bus Voltage | System fault — VSD source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 40 Low DC Bus Voltage | System fault — VSD source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 41 DC Bus Voltage Imbalance | System fault — VSD source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 42 High Motor Current | System fault — VSD source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 43 Motor Current Overload (Software) | System fault — VSD source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 44 IGBT Gate Driver Fault | System fault — VSD source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 45 High Baseplate Temperature | System fault — VSD source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 46 Single Phase Input | System fault — VSD source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 47 VSD Run Signal Fault | System fault — VSD source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 48 High Discharge Press (Hardware – HPCO) | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 49 Spare | System fault — Panel source | 17 | ||
| 50 Control Voltage Fault | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 51 Low Discharge Superheat | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 52 Low Suction Pressure Smart Freeze | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 53 Isolation Valve Failed to Close Warning | System fault — Panel source | 17 | ||
| 54 Isolation Valve Failed to Open Fault | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 55 High Discharge Pressure Rate | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 56 Condenser Fan VSD Warning | System fault — Panel source | 17 | ||
| 57 Low Economizer Superheat | System fault — Panel source | If a system fault threshold is exceeded for 3 seconds, only the affected system is shut down (not the whole unit/all systems). System faults are auto-reset; the system restarts automatically after the fault condition clears. If 3 faults on the same system occur within 90 minutes, that system is locked out after the third fault. Lockout requires manual reset: the operator must cycle the system switch off then on to clear the lockout. | 17 | |
| 58 SPARE | System fault — source not listed | 17 | ||
| 59 SPARE | System fault — source not listed | 17 | ||
| 60 SPARE | System fault — source not listed | 17 | ||
| 61 SPARE | System fault — source not listed | 17 | ||
| 62 SPARE | System fault — source not listed | 17 |
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. The short table of all YORK YVAA messages: fault codes.
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.