M thermal Mono
104 200204
Midea M thermal Mono Service Manual
Procedure
Air side heat exchanger refrigerant outlet
temperature sensor is loose
1
Ensure the temperature sensor is
connected properly
Air side heat exchanger refrigerant outlet
temperature sensor has short-circuited
or failed
2
Replace the temperature sensor
The air side heat exchanger heat
exchange is poor
3
Inspect the system and fix the error
The fan or fan motor is blocked or
damaged
Inspect the system and fix the error
Notes:
1. Air side heat exchanger refrigerant outlet temperature sensor and outdoor ambient temperature sensor connections are port CN9 on the refrigerant
system main PCB (labeled 12 in Figure 4-2.2 in Part 4, 2.3 “Main PCBs for Refrigerant System, Inverter Modules and Filter Boards”, (labeled 5 in Figure 4-2.4
in Part 4, 2.3 “Main PCBs for Refrigerant System, Inverter Modules and Filter Boards” and labeled 6 in Figure 4-2.6 in Part 4, 2.3 “Main PCBs for Refrigerant
System, Inverter Modules and Filter Boards”).
2. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance
characteristics table, the sensor has failed. Refer to Part 2, 1 “Layout of Functional Components” and to Table 4-5.1 in Part 4, 5.1 “Temperature Sensor
Resistance Characteristics”.
3. Check air side heat exchanger, fan(s) and air outlets for dirt/blockages.