Midea MEHS-09NIH2 Service Manual page 51

10.4.8 Over voltage or too low voltage protection diagnosis and solution(P1)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
P1
An abnormal voltage rise or drop is detected by checking the
specified voltage detection circuit.
Power supply problems.
●
System leakage or block
●
PCB faulty
●
49
Remark:
Measure the DC voltage
between P and N port.
The normal value should
be around 310V.