Carrier Air Conditioning 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.
Acronyms
OLF= Outdoor LED Flash, OL = Operation Lamp, TL = Timer Lamp