Midea SMK-60/CGN8, Service Manual

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M‐Thermal Split
201909 49
Procedure
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
main PCB (labeled 12 in Figure 4‐2.2 in Part4, 2.3 "Main PCBs for Refrigerant System, Inverter Module". Discharge pipe temperature sensor connection is
port CN8 on the refrigerant system main PCBs (labeled 11 in Figure 4‐2.2 in Part4, 2.3 "Main PCBs for Refrigerant System, Inverter Module"). Suction pipe
temperature sensor connection is port CN1 on the main control board (labeled 13 in Figure 4‐2.2 in Part4, 2.3 "Main PCBs for Refrigerant System, Inverter
Module").
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 Table 4‐5.1, and Table 4‐5.2 in Part 4, 5.1 “Temperature Sensor Resistance Characteristics”.
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