Resetting Phenomenon Often Occurs During Operation; Operation Lamp Off And Timer Lamp Flashes - Midea MSH-21HRN1-QB8 Service Manual

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 .
After changing indoor fan motor , check if the failure realease .
Power supply circuit has problems .
10.5 Over current protection of the compressor occurs 4 times
Over current protection of the compressor occurs 4 times

Operation lamp off and Timer lamp flashes

After changing the main control board , check if the failure realease .
The voltage of power supply is too low (less than 187V).
28
Yes
Yes
YES
Power supply fault .
Service manual
Yes
Indoor PCB is defective.
Indoor PCB is defective.
Outdoor unit fault (such
as the compressor).
No
No