Midea M4OC-36HRFN1-M - Compressor Top Temperature Protection Diagnosis; Inverter Compressor Drive Error Diagnosis

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