Midea V6 Series Service Manual page 131

V6 VRF 50Hz
2.26.5 Procedure
Compressor top temperature sensor
and/or discharge pipe temperature
sensor connections on main PCB are
Compressor top temperature sensor
and/or discharge pipe temperature
sensor have short circuited or failed
Poor heat insulation of compressor top
temperature sensor resulting in
temperature reading lower than actual
Excess refrigerant
Discharge pressure is too high
Replace outdoor main PCB
Notes:
1. Compressor top temperature sensor and discharge pipe temperature sensor connections are ports CN4 and CN5 on the main PCB (labeled 3 and 4,
respectively, in Figure 5-2.1 in Part 5, 2.1 "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 Table 6-3.2 in Part 6, 3.1 "Temperature Sensor Resistance Characteristics".
3. Excess refrigerant causes discharge temperature to be lower than normal, discharge pressure to be higher than normal and suction pressure to be higher
than normal. For normal system parameters refer to Table 6-3.4 and 6-3.5 in Part 6, 3.2 "Normal Operating Parameters of Refrigerant System".
4. See "P1 Troubleshooting".
130
PP
1
loose
No
2
No
temperature
No
3
No
No
Ensure the sensors are connected
Yes
properly
Yes
Replace the faulty sensor(s)
Ensure sufficient heat insulation for
Yes
compressor top temperature senor
Discharge part of the refrigerant. Add oil
Yes
if it leaks during discharge
Yes
Troubleshoot as for a P1 error
4