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Carrier Troubleshooting

List of Carrier Aircon Error Codes

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Running into aircon problems with your Carrier unit? If you’ve already tried doing every troubleshooting tip there is to fix the issue, your next best bet is to check the air conditioner error code for an instant diagnosis and direct repair.


In this complete guide, we’ll show you the different indoor and outdoor error codes that you can check to identify the status of your air conditioner and the issue that’s causing the problem.


Indoor Error Codes

Code Possible Cause
E0 Indoor unit EEPROM parameter error
E1 Indoor / outdoor units communication error
E3 Indoor fan speed has been out of control
E4 Indoor room temperature sensor T1 open circuit or short circuit
E5 Evaporator coil temperature sensor T2 open circuit or short circuit
EC Refrigerant Leakage Detection
F1 Outdoor ambient temperature sensor T4 open circuit or short circuit
F2 Condenser coil temperature sensor T3 open circuit or short circuit
F3 Compressor discharge temperature sensor T5 open circuit or short circuit
F4 Outdoor unit EEPROM parameter error
F5 Outdoor fan speed has been out of control
P0 IPM malfunction or IGBT over-strong current protection
P1 Over voltage or over low voltage protection
P2 High temperature protection of compressor top diagnosis and solution
P4 Inverter compressor drive error
P5 Mode conflict
P6 Compressor voltage protection

Outdoor Error Codes

Code Possible Cause
E0 Outdoor EEPROM malfunction
E2 Indoor/outdoor units communication error
E3 Communication malfunction between IPM board and outdoor main board
E4 Open or short circuit of outdoor unit temperature sensor
E5 Voltage protection
E8 Outdoor fan speed malfunction
F1 No A Indoor unit coil outlet temperature sensor or connector of sensor is defective
F2 No B Indoor unit coil outlet temperature sensor or connector of sensor is defective
F3 No C Indoor unit coil outlet temperature sensor or connector of sensor is defective
F4 No D Indoor unit coil outlet temperature sensor or connector of sensor is defective
F5 No E Indoor unit coil outlet temperature sensor or connector of sensor is defective
P1 High pressure protection
P2 Low pressure protection
P3 Current protection of compressor
P4 Temperature protection of compressor
P5 High temperature protection of condenser
P6 IPM module protection

Related article: List of Mitsubishi Aircon Error Codes

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