Carrier Error Code Search

Error code search offers information on the cause of the malfunction and the status of your air conditioner by entering the error code.


  1. 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 the model.

2. It is always advised that you consult with an HVAC repair professional before attempting to provide any repairs yourself.

3. Precision Air assumes no responsibility for any accidents or troubles caused in the disassembly or repair of equipment performed according to the information on this page.

carrier air conditioner


If molded case circuit breakers or earth leakage circuit breakers have tripped, do not reset the breaker immediately without first checking for any problems with the insulation of equipment.

Resetting breakers without a check of insulation may cause damage to equipment.

Carrier Air Conditioning Codes:


EO: (OL 1 Times) Indoor unit EEPROM parameter error.

E1: (OL 2 Times) Indoor / outdoor units communication error.

E3: (OL 4 Times) The speed of the indoor fan has gone out of control.

E4: (OL 5 Times) Indoor room temperature sensor T1 open circuit or short circuit.

E5: (OL 6 Times) Evaporator coil temperature sensor T2 open circuit or short circuit.

EC: (OL 7 Times) Refrigerant leak detection.

F1: (OL 2 Times, TL on) Outdoor ambient temperature sensor T4 open circuit or short

F2: (OL 3 Times TL on) circuit. Condenser coil temperature sensor T3 open circuit or short circuit.

F3: (OL 4 Times, TL on) Compressor discharge temperature sensor T5 open circuit or short circuit.

F4: (OL 5 on) Outdoor unit EEPROM parameter error.

F5: (OL 6 on) The speed of the outdoor fan is out of control.

P0: (OL 1 flash) Strong current protection over IPM malfunction or IGBT.

P1: (OL 2 flash) Over voltage or low voltage protection.

P2: (OL 3 flash) High temperature protection of compressor top diagnostics and solutions.

P4: (OL 4 flash) Inverter compressor drive error.

F8: (OLF 9 Times) Compressor Suction Temperature sensor defective.

L3: (OLF 33 Times) Drive Phase current overload defective.

L4: (OLF 34 Times) Phase Current Sampling defective.

FO: (OLF 13 Times) Outdoor AC Current protection.

L1: (OLF 31 Times) Drive bus voltage overload protection.

L2: (OLF 32 Times) Drive bus voltage overflow protection.

P5: (OLF 14 Times) Compressor phase current protection.

P6: (OLF 16 Times) Outdoor over high/over-low DC voltage protection.

P7: (OLF 17 Times) IPM Temperature over heat protection.

P8: (OLF 18 Times) Compressor discharge Temperature overheat protection.

P9: (OLF 19 Times) Cooling indoor Unit anti-freezing protection.

PU: (OLF 20 Times) Cooling Outdoor Coil over heat protection.

PE: (OLF 21 Times) Heating indoor coil over heat protection.

PC: (OLF 22 Times) Cooling outdoor ambient Temperature over-low protection.

PH: (OLF 23 Times) Heating outdoor ambient Temperature over-high protection.

E2: (OLF 27 Times) Zero crossing signal detection error.

OLF= Outdoor LED Flash, OL = Operation Lamp, TL = Timer Lamp

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