Midea MSH-21HRN1-QB8, Руководство по обслуживанию

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Service manual
28
10.4 Resetting phenomenon often occurs during operation.
(That is automatically entering to the status when power is on.)
The reason is that the instantaneous voltage of main chip is less than 4.5V. Check according to the following
procedure:
Resetting phenomenon often occurs during operation .
After changing indoor PCB , check if the failure realease .
Yes
After changing indoor fan motor , check if the failure realease .
Yes
YES
Yes
Power supply circuit has problems .
Indoor PCB is defective.
10.5 Over current protection of the compressor occurs 4 times
Operation lamp off and Timer lamp flashes
The voltage of power supply is too low (less than 187V).
No
Indoor PCB is defective.
After changing the main control board , check if the failure realease .
Power supply fault .
No
Outdoor unit fault (such
as the compressor).
Over current protection of the compressor occurs 4 times