HVAC Toolkit
Y

York Error Codes

Inverter Mini-Splits & Air Conditioners ยท USA

Prefixes: E=System/Sensor, F=Sensor/Protection, P=Protection, H=Status

E-Series (System/Sensor Errors)

Code Description Possible Cause Action
E0 EEPROM malfunction EEPROM data error Reset power; replace PCB if persists
E1 Indoor/outdoor communication error Communication line fault Check signal wiring and connectors
E2 Zero crossing signal error Power supply issue Check power supply voltage and frequency
E3 Indoor fan speed error Fan motor abnormal Check fan motor and driver circuit
E4 Room temperature sensor open/short T1 sensor fault Check and replace room sensor
E5 Indoor coil sensor open/short T2 sensor fault Check and replace coil sensor
E6 Outdoor coil sensor fault Outdoor thermistor failure Check outdoor coil temperature sensor
E7 Outdoor discharge sensor fault Discharge thermistor open or short Check compressor discharge sensor
E8 Outdoor ambient sensor fault Outdoor temperature sensor failure Check outdoor ambient thermistor
EC Refrigerant leak detected Leak sensor triggered Check for leaks, repair and recharge

F-Series (Sensor/Protection Codes)

Code Description Possible Cause Action
F1 Condenser high temperature protection Condenser coil overheating Clean condenser, check fan operation
F2 Evaporator freeze protection Evaporator coil freezing Check airflow, filter, refrigerant charge
F3 Discharge temperature protection High discharge temperature Check superheat and refrigerant charge
F4 Compressor overload protection Compressor overcurrent Check compressor and power supply

H-Series (Status/Protection)

Code Description Possible Cause Action
H1 Defrost in progress Normal defrost cycle Normal operation, wait for completion
H5 IPM module protection Inverter module fault Check IPM and compressor

P-Series (Protection Codes)

Code Description Possible Cause Action
P0 IPM overcurrent protection Inverter overcurrent Check compressor and inverter board
P1 High/low voltage protection Supply voltage abnormal Check voltage at outdoor unit
P2 Compressor overheating protection Compressor top temperature high Check superheat, charge, airflow
P4 Compressor drive error Inverter drive fault Check inverter board, compressor wiring

York Troubleshooting Tips

Before Calling for Service

  • Turn off unit, wait 5 minutes, then restart - some errors auto-reset
  • Check and clean air filters - many errors caused by restricted airflow
  • Verify power supply voltage is within specification
  • Check circuit breaker and disconnect switch
  • Note the exact error code and when it occurs for technician

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