U2Daikin
Daikin U2 Error Code
Power supply insufficient / voltage defect
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Other Daikin Error Codes
A1
Indoor unit PCB malfunction
A3
Drain level control system malfunction
A5
High pressure / freeze-up protection activated
A6
Fan motor locked, overloaded, or overcurrent
C4
Liquid pipe thermistor malfunction
C5
Gas pipe thermistor malfunction
C9
Suction air thermistor malfunction
E1
Outdoor unit PCB defect
E3
High pressure switch actuation
E4
Low pressure switch actuation
E5
Inverter compressor motor overheat/lock
E7
Outdoor unit fan motor malfunction