Midea MV6-R252WV2RN1 - 2.26.5 Procedure

V6R VRF 50Hz
139
Part
6
-
Diagnosis and Troubleshooting
Procedure
PP
Compressor discharge pipe temperature
sensor does not be properly connected
to outdoor main PCB.
1
Yes
Ensure the sensor are connected
properly
No
Compressor discharge pipe temperature
sensor have short circuited or failed
2
Yes
Replace the faulty sensor
No
High pressure sensor connection on
outdoor main PCB is loose
3
Yes
Ensure the sensor is connected properly
No
High pressure sensor has short-circuited
or failed
4
Yes
Replace the sensor
No
T7-Te <3°C ?
Yes
Check the fault that EEVA in MS can not
be fully closed. Or check the fault that
expansion valve of IDU can not be fully
closed or the fan does not work, which
may result in partial evaporation.
No
T6B-T6A<3°C and T6A-Te <3°C and EEVC
minimum opening?
T8 -Te <2°C and EEVA minimum
opening(Evaporator)?
Yes
Check the fault that EEVA or EEVC can’t
be completely closed; or SV5 can’t be
opened.
No
Excess refrigerant
5
Yes
Discharge part of the refrigerant. Add oil
if it leaks during discharge
No
Replace the outdoor main PCB
Notes:
1. Compressor top temperature sensor and discharge pipe temperature sensor connections are ports CN4 on the outdoor main PCB.
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.
3. High pressure sensor connection is port CN17 on the outdoor main PCB.
4. Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor has
failed.
5. 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.