Midea M2OC-18HFN1-M Service Manual page 54

9.4.1.8 Temperature protection of compressor top diagnosis and solution.
Malfunction decision
conditions
Supposed causes
Temperature protection of
compressor top
Whether compressor
operates?
Yes
Whether refrigerant
circulation volume is
normal?
No
Charge refrigerant
Whether abnormality is the
same after gas charging?
No
Check refrigerant system
(such as clogging of capillary
etc.)
9.4.1.9 Inverter compressor drive error diagnosis and solution
The trouble shooting is same with one of IPM module protection(P0).
If the sampling voltage is not 5V, the LED will display the
failure.
● Wiring mistake
● Over load protector faulty
● System block
● Outdoor PCB faulty
Whether the connection is
No
good?
Yes
Whether protector is normal? If
protector is normal,resistance = 0
Yes
Replace the outdoor main PCB
No Reconnect and retest.
No Replace the protector.