Midea ATOM MDV-V56WDHN1(AtB) - Page 76

Atom B Series VRF 50/60Hz
75
Part
6
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Diagnosis and Troubleshooting
2.19.5 Procedure
P5
Outdoor heat exchanger temperature
sensor connection on main PCB is loose
Yes
Ensure the sensor is connected properly
No
Outdoor heat exchanger temperature
sensor has short-circuited or failed
1
Yes
Replace the sensor
No
The indoor load is too large
2
Yes
Make sure the combination ratio is less than
130%
No
System contains air or nitrogen
3
Yes
Flush all refrigerant then vacuum the system and
recharge the refrigerant. Add oil to the system if it
leaks
No
The condenser heat exchange is poor
4
Yes
Inspect the system and fix the error
No
The high pressure side is blocked, caused
by crushed or bent pipe or blocked EXV
5
Yes
Inspect the system and fix the error
No
Replace outdoor main PCB
Notes:
1. 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.
2. An indoor load that is too large causes suction and discharge temperatures to be higher than normal.
3. Air or nitrogen in the system causes discharge temperature to be higher than normal, discharge pressure to be higher than normal, compressor current to
be higher than normal, abnormal compressor noise and an unsteady pressure meter reading.
4. In cooling mode check outdoor heat exchangers, fans and air outlets for dirt/blockages. In heating mode check indoor heat exchangers, fans and air outlets
for dirt/blockages.
5. High pressure side blockage causes discharge temperature to be higher than normal, discharge pressure to be higher than normal and suction pressure to
be lower than normal.