Midea ATOM MDV-V56WDHN1(AtB) - Page 70

Atom B Series VRF 50/60Hz
69
Part
6
-
Diagnosis and Troubleshooting
2.19.5 Procedure
P2
the outdoor ambient temperature is too
low
Yes
Stop the unit
No
Low pressure sensor connection on main
PCB is loose
Yes
Ensure the sensor is connected properly
No
Low pressure sensor has short-circuited or
failed
1
Yes
Replace the sensor
No
Insufficient refrigerant caused by
refrigerant leakage
2
Yes
Add refrigerant or inspect the system for
leaks
No
The low pressure side is blocked, caused by
crushed or bent pipe, blocked EXV, or dirty
filter
3
Yes
Inspect the system and fix the error. If the
filter is blocked by ice, the piping should be
cleaned
No
The evaporator heat exchange is poor
4
Yes
Inspect the system and fix the error
No
Replace outdoor main PCB
Notes:
1. 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.
2. An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and suction pressures to be lower than normal
and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. These issues disappear once sufficient refrigerant has
been charged into the system.
3. A low pressure side blockage causes compressor discharge temperature to be higher than normal, suction pressure to be lower than normal and compressor
current to be lower than normal, and may cause frosting to occur on the suction pipe.
4. In cooling mode check indoor heat exchangers, fans and air outlets for dirt/blockages. In heating mode check outdoor heat exchangers, fans and air outlets
for dirt/blockages.