York Air Conditioner Error Codes

York Air Conditioner Error Codes This page provides a simple explanation concerning content relating to error codes and their possible causes. Please note that the content may slightly differ depending on models. Error Codes. By checking the error code, you are able to identify the status and the issue of the air conditioner/air conditioning system.

York Air Conditioner Error Code Solutions

Error CodesCause
E0Indoor EEPROM (Electrically Erasable Programmable Read-Only Memory) error
E1Indoor and outdoor unit communication malfunction
E3Indoor fan speed malfunction
E4Indoor room temperature sensor error
E5Evaporator coil temperature sensor error
ECRefrigerant leak detection system malfunction
EEWater level alarm malfunction
E8Dual indoor unit (twin model only) communication malfunction
E9Other twin model malfunction
F0Overload protection
F1Outdoor temperature sensor error
F2Outdoor condenser pipe sensor error
F3Discharge air temperature sensor error
F4Outdoor EEPROM (Electrically Erasable Programmable Read-Only Memory) error
F5Outdoor fan speed (DC fan motor only) malfunction
F6T2b sensor error
F7Auto-lifting panel communication error
F8Auto-lifting panel malfunction
F9Auto-lifting panel is open
P0Inverter module IPM protection
P1High/Low voltage protection
P2Compressor top overheating protection
P3Outdoor low temperature protection
P4Compressor drive error
P5Mode conflict
P6Compressor low-pressure protection
P7Outdoor IGBT sensor error

York Central Controller Fault Codes:

York Central Controller Fault Codes

H3: Outdoor adding malfunction (valid for host unit)

H2: Outdoor decreasing malfunction (valid for host unit)

H1: Net communication malfunction

EF: Other malfunction

E4-T4: Temp. Sensor malfunction

E3-T3: Temp. Sensor malfunction

E2: Sensor malfunction

E1-E0: Communication malfunction Phase sequence or lack of phase

PF: Other Protection

PE: Oil Balance

PD: Oil Return

PA: Defrost Protection

P8: Compressor Current 3rd Protection

P7: Compressor Current 2nd Protection

P5: Condenser High Temp. Protection

P4: Discharge Pipe Temp. Protection

P3: Compressor Current 1st Protection

P2: Discharge Low- pressure Protection

P1-P0: Discharge High- pressure Protection Compressor High Temp. Protection

York Air Conditioner Remote Control

Malfunction Code of Outdoor unit:

E1: Phase sequence error

E2: Communication malfunction between indoor/outdoor units

E3: T3 temperature sensor malfunction

E4: T4 temperature sensor malfunction

E5: T5 temperature sensor malfunction

E6: Water-level alarm malfunction

York Central Air Conditioning Error Codes:

York Central Air Conditioning Error Codes

EF: Other malfunction PF Other Protection

EE: Water level checking malfunction PE Reserve

ED: Outdoor protection PD Reserve

EC: Clear malfunction PC Reserve

EB: Inverter Module Protection PB Reserve

EA: Compressor Over-current (4 times) PA Reserve

E9: Communication malfunction between PCB and Display board P9 Reserve

E8: Fan motor checking out of control P8 Compressor Over-current

E7: EEPROM malfunction P7 Power Lack/Over Volt Protection

E6: Over-zero checking malfunction P6 Discharge Low-pressure Protection

E5: T3 sensor malfunction P5 Discharge High-pressure Protection

E4: T2B sensor malfunction P4 Discharge Pipe Temp. Protection

E3: T2A sensor malfunction P3 Compressor Temp. Protection

E2: T1 sensor malfunction P2 Condenser High Temp. Protection

E1: Communication malfunction P1 Anti-cooling or Defrost Protection

E0: Phase sequence or lack of phase P0 Evaporator Temp. Protection

03#: CCM/PC(gateway) Communication Malfunction

02#: CCM/Function Module Communication Malfunction

01#: CCM/NIM Communication Malfunction

00#: CCM/PCB Communication Malfunction

York Wall Mounted Type Ac Error Codes:

York Wall Mounted Type Ac Error Codes

E7: Communication fault between indoor and outdoor units

E1: Room temperature sensor failure

E4: Indoor EEPROM error

E14: Indoor fan motor malfunction

F12: Outdoor EEPROM error

F1: The protection of IPM

F22: Overcurrent protection of AC electricity for the outdoor model

F3: Communication fault between the IPM and outdoor PCB

F19: Power voltage is too high or low

F4: Overheat protection for Discharge temperature

F8: Outdoor DC fan motor fault

F21: Defrost temperature sensor failure

F7: Suction temperature sensor failure

F6: Ambient temperature sensor failure

F25: Discharge temperature sensor failure

F11: deviate from the normal for the compressor

F28: Loop of the station detect error

F2: Overcurrent of the compressor

F23: Overcurrent protection for single-phase of the compressor

Commercial Air Conditioning:

York Product Diagnosis Procedure-Diagnostic code for outdoor unit;

YORK AC Troubleshooting

When troubles occur, please check the following points before contacting a repair company

Problem: The unit is not working

Possible Causes:

  1. Power failure
  2. The power switch is off
  3. The fuse is burned out
  4. Remote control batteries are dead
  5. The unit’s 3-minute protection has been activated


  1. Wait for the power to be restored
  2. Turn on the power
  3. Replace the fuse
  4. Replace the remote control batteries
  5. Wait three minutes after restarting the unit

Problem: Poor cooling performance

Possible Causes:

  1. Temperature setting may be higher than the ambient room temperature
  2. The heat exchanger on the indoor or outdoor unit is dirty
  3. The air filter is dirty
  4. The air inlet or outlet of either unit is blocked
  5. Doors and windows are open
  6. Excessive heat is generated by sunlight
  7. Low refrigerant due to leak or long-term use


  1. Lower the temperature setting
  2. Clean the affected heat exchanger
  3. Remove the filter and clean it according to instructions
  4. Turn the unit off, remove the obstruction and turn it back on
  5. Make sure that all doors and windows are closed while operating the unit
  6. Close windows and curtains during periods of high heat or bright sunshine
  7. Check for leaks, re-seal if necessary and top off refrigerant
YORK AC Indoor Unit Display

Problem: The unit starts and stops frequently 

Possible Causes:

  1. There’s too much or too little refrigerant in the system
  2. There is air, incompressible gas or foreign material in the refrigeration system
  3. System circuit is blocked
  4. The compressor is broken
  5. The voltage is too high or too low


  1. Check for leaks and recharge the system with refrigerant
  2. Evacuate and recharge the system with refrigerant
  3. Determine which circuit is blocked and replace the malfunctioning piece of equipment
  4. Replace the compressor
  5. Install a manostat to regulate the voltage

Problem: Poor heating performance

Possible Causes:

  1. The outdoor temperature is lower than 7°C (44.5°F)
  2. Cold air is entering through doors and windows
  3. Low refrigerant due to leak or long-term use


  1. Check for leaks and recharge the system with refrigerant
  2. Make sure that all doors and windows are closed during use
  3. Check for leaks, re-seal if necessary and top off refrigerant

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