Midea MSH-07CRN1, MSH-07HRN1, MSH-09CRN1, MSH-09HRN1, MSH-12CRN1, MSH-12HRN1 Manual page 274

4. Failure phenomenon for cooling only type
Indoor fan speed has been out of control for over 1 minute
Indoor room temp. or evaporator sensor is open circuit or short circuit
Over current protection of the compressor occurs 4 times
EEPROM error
r Extinguish
Flash at 5Hz
4.1 Operation lamp flashes and Timer lamp off.
Operation lamp flashes and Timer lamp off.
Change the main control board
4.2 Operation lamp flashes and Timer lamp on.
Is connection to connector good?
4.3 Operation lamp off and Timer lamp flashes
Operation lamp off and Timer lamp flashes
After changing the main control board, check if the failure releases
The voltage of power supply is too low (less than 187V)?
4.4 Operation lamp on and Timer lamp flashes
EEPROM error, indoor PCB is defective.
Failure phenomenon
Yes
yes
Replace the sensor
No
Yes
Power supply fault
Operation lamp
Repair connector
.
No
Outdoor unit fault (such as the compressor)
2
Timer lamp
X
On
X
On
No
Yes
Indoor PCB is defective