Midea M3OF-27HFN1-M - Compressor Drive Malfunction Diagnosis and Solution; Water-Level Alarm Malfunction Diagnosis and Solution

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7.4.1.8 Compressor drive malfunction diagnosis and solution
The trouble shooting is same with one of IPM module protection.
7.4.1.9 Water-level alarm malfunction diagnosis and solution
Malfunction conditions
If the sampling voltage is not 5V, the LED will display the failure code.
Potential causes
● Wiring mistakes
● Faulty water-level switch
● Faulty water pump
● Faulty indoor PCB
If the water-level switch
is inserted well?
If the water-level switch
is inserted well?
No
Insert the water-level switch well
Insert the water-level switch well
If the water-level switch
is broken?
If the water-level switch
is broken?
Yes
Replace the water-level switch
Replace the water-level switch
Replace the water pump, If
malfunction is still not
solved
Replace the water pump, If
malfunction is still not
solved
Yes
No
Yes
Replace the indoor main PCB
Replace the indoor main PCB
Power off, then restart the unit 3 minutes
later. Is it still displaying the error code?
Power off, then restart the unit 3 minutes
later. Is it still displaying the error code?
Yes