Midea MHC-V22W/D2RN8 - EE Troubleshooting

M thermal Mono
46 202008
Midea M thermal Mono
Service Manual
Procedure 4.6.4
E5 / E6 / E9 / EA
Temperature sensor connection on
outdoor unit main PCB is loose
1
Yes
Ensure the sensor is connected properly
No
Temperature sensor has short-circuited
or failed
2
Yes
Replace the sensor
No
Replace outdoor unit main PCB
Notes:
1. Air side heat exchanger refrigerant outlet temperature sensor and outdoor ambient temperature sensor connections are port CN9 on the outdoor unit
refrigerant system main PCB (labeled 6 in Figure 4-2.2). Discharge pipe temperature sensor connection are port CN8 on the outdoor unit refrigerant system
main PCB (labeled 5 in Figure 4-2.2). Suction pipe temperature sensor connection are port CN5 on the outdoor unit refrigerant system main PCB (labeled 4
in Figure 4-2.2).
2. Set a multi-meter to buzzer mode and test any two terminals of sensor. If the resistance is too low, the buzzer sounds, which means the sensor has
short-circuited. If the resistance is not consistent with the sensor s resistance characteristics table, the sensor has failed. Refer to Table 4-5.1, and Table
4-5.2.
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