Carrier 38HVM109303 - 9 Troubleshooting; Indoor Unit Error Display

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9. Troubleshooting
9.1 Indoor Unit Error Display
Operation lamp
Timer lamp
Display
LED STATUS
☆ 1 time X E0
Indoor unit EEPROM parameter error
☆ 2 times X E1
Indoor / outdoor units communication error
☆ 4 times X E3 Indoor fan speed has been out of control
☆ 5 times X E4
Indoor room temperature sensor T1 open circuit or short
circuit
☆ 6 times X E5
Evaporator coil temperature sensor T2 open circuit or
short circuit
☆ 7 times X EC Refrigerant Leakage Detection
☆ 2 times O F1
Outdoor ambient temperature sensor T4 open circuit or
short circuit
☆ 3 times O F2
Condenser coil temperature sensor T3 open circuit or
short circuit
☆ 4 times O F3
Compressor discharge temperature sensor T5 open
circuit or short circuit
☆ 5 times O F4 Outdoor unit EEPROM parameter error
☆ 6 times O F5 Outdoor fan speed has been out of control
☆ 1 times ☆ P0 IPM malfunction or IGBT over-strong current protection
☆ 2 times ☆ P1 Over voltage or over low voltage protection
☆ 3 times
☆ P2
High temperature protection of compressor top diagnosis
and solution(only for 9k,12k models)
☆ 5 times ☆ P4 Inverter compressor drive error
O（light） X（off） ☆（flash）