Midea M4OC-36HRDN1-M - Page 30

Indoor unit display LED STATUS
P2 Temperature protection of compressor top.
Indoor unit display LED STATUS
P3 Outdoor temp. too low protection
The trouble shooting is same with one of outdoor unit P3 protection.
Indoor unit display LED STATUS
P4 Inverter compressor drive error
Yes
Replace the outdoor PCB
Replace inverter compressor.
Reconnect and retry
No
No
Is the connection of compressor good?
Is the wiring sequence right? The voltage
range proper?
Yes
Yes
No,
Charge refrigerant
Is the abnormality the same
after gas charging?
Replace the outdoor PCB.
No
Yes
Is protector normal?
No
No
Is the connection good?
Is refrigerant circulation
volume normal?
Reconnect it
Does the compressor operate?
Replace it
There is block
(Such as capillary or
welded points of the pipes.)