Midea MSH-07CRN1, MSH-07HRN1, MSH-09CRN1, MSH-09HRN1, MSH-12CRN1, MSH-12HRN1 - Operation Lamp on and Timer Lamp Flashes; Operation Lamp Flashes and Timer Lamp off; Operation Lamp off and Timer Lamp Flashes; Failure Phenomenon

9.3.3 Failure phenomenon
Failure phenomenon Operation lamp Timer lamp
Indoor fan speed has been out of control for over 1 minute ☆ X
Indoor room temp. or evaporator sensor is open circuit or short circuit ☆ On
Over current protection of the compressor occurs 4 times X ☆
EEROM error On ☆
No over-zero signal ☆ ☆
r Extinguish
☆ Flash at 5Hz
9.3.3.1 Operation lamp flashes and Timer lamp off.
Is connector connection good?
Is voltage being applied to the fan motor?
Fan motor is defective
Repair the connector
No Yes
Yes No
Indoor PCB is defective
9.3.3.2 Operation lamp flashes and Timer lamp on.
Is connection to connector good?
Replace the sensor
No
Yes
Repair connector
9.3.3.3 Operation lamp off and Timer lamp flashes
No Yes
Yes No
Indoor PCB is defective
Power supply fault Outdoor unit fault (such as the compressor)
Yes
A
fter changing the main control board, check if the failure releases.
The voltage of power supply is too low (less than 187V)?
Operation lamp off and Timer lamp flashes
9.3.3.4 Operation lamp on and Timer lamp flashes
EEROM error, indoor PCB is defective.
9.3.3.5 Operation lamp flashes, Timer lamp flashes .
This is alarm signal when the main chip can’t detect over-zero signal. When such failure occurs, the main
control board must have fault.
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