Carrier error codes

Air Conditioning FAQs

What are error codes anyway?

Error codes help people know when their air conditioning system needs to be repaired or isn’t working optimally. Each error code has a meaning to help you understand the problem and what needs to be done to fix it.

Below are the error codes for Carrier systems and the matching explanation.

What do I do if I see an error code?

  1. Try to reset your system as a first step

This will delete your AC’s on board memory. We recommend trying this simple trouble-shooting solution before spending money on a service call.

Separate your AC system from its power supply. Unplug it from a power point, turn off the isolator next to the outdoor unit or shut down your house’s power from the electrical board. Then leave it for 15 to 30 minutes.

  1. Call a technician who can solve the problem for you

Have a technician come out to look into the issue. This will make sure you don’t accidentally cause further damage to your air conditioning system.

Table of Error 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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