Carrier 38MBQ Series - Indoor Unit Diagnostic Codes; Indoor Unit Error Code Reference

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DIAGNOSTIC GUIDES
Table 14—Diagnostic Guides Indoor Units
OPERATION LAMP TIMER LAMP DISPLAY LED STATUS
☆ 1 time X E0 Indoor unit EEPROM parameter error
☆ 2 times X E1 Communication malfunction between indoor and outdoor units
☆ 4 times X E3 Indoor fan speed malfunction
☆ 5 times X E4 Indoor room temperature sensor (T1 ) malfunction
☆ 6 times X E5 Evaporator coil temperature sensor (T2) malfunction
☆ 7 times X EC Refrigerant leakage detection
☆ 8 times X EE Water-level alarm malfunction
☆ 1 time O F0 Current overload protection
☆ 2 times O F1 Outdoor ambient temperature sensor (T4 ) malfunction
☆ 3 times O F2 Condenser coil temperature sensor (T3) malfunction
☆ 4 times O F3 Compressor discharge temperature sensor (T5) malfunction
☆ 5 times O F4 Outdoor unit EEPROM parameter error
☆ 6 times O F5 Outdoor fan speed malfunction
☆ 7 times O F6 Indoor coil outlet pipe sensor(Located on outdoor unit low pressure valve)
☆ 8 times O F7 Communication malfunction between the cassette optional lift panel and the unit
☆ 9 times O F8 Cassette optional lift panel malfunction
☆ 10 times O F9 Cassette optional lift panel not closed
☆ 1 time ☆ P0 Inverter module (IPM) malfunction
☆ 2 times ☆ P1 Over-voltage or under-voltage protection
☆ 3 times ☆ P2 Compressor top high temperature protection (OLP)
☆ 4 times ☆ P3 Low ambient temperature cut off in heating
☆ 5 times ☆ P4 Compressor drive malfunction
☆ 6 times ☆ P5 Indoor units mode conflict
☆ 7 times ☆ P6 Low pressure protection
☆ 8 times ☆ P7 Outdoor IPM temperature sensor error
O（light） X（off） ☆（flash）