Midea MV5-X252W/V2GN1 - 4.5.4 Procedure

V5 X VRF 50/60Hz
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Part 5 - Diagnosis and Troubleshooting
Procedure 4.5.4
E4 / E7
Temperature sensor connection on 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 main PCB
Notes:
1. Outdoor ambient temperature sensor connection is port CN1 on the main PCB (labeled 32 in Figure 5-2.1 in Part 5, 2.2 “Ports”). Compressor top
temperature sensor and discharge pipe temperature sensor connections are ports CN10 and CN11 on the main PCB (labeled 1 and 2, respectively, in Figure
5-2.1 in Part 5, 2.2 “Ports”).
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 5-5.1 or 5-5.2 in Part 5, 5.1 “Temperature
Sensor Resistance Characteristics”.