Midea MV5-X252W/V2GN1 Service Manual page 88

4.17.4 Procedure
ODU stop valves are closed
Insufficient refrigerant caused by
refrigerant leakage
The low pressure side is blocked, caused
by crushed or bent pipe, blocked EXV, or
The evaporator heat exchange is poor
Replace outdoor main PCB
Notes:
1. To check for insufficient refrigerant:

Re-start the outdoor units. If an r1, r2 or r3 error is displayed upon start-up, there is insufficient refrigerant in the system.

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. For normal system parameters refer to Tables 5-5.4 and 5-5.5 in Part 5, 5.2 "Normal
Operating Parameters of Refrigerant System".
2. 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. For normal system parameters refer to Tables 5-5.4 and
5-5.5 in Part 5, 5.2 "Normal Operating Parameters of Refrigerant System".
3. 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.
201608
P2 / H5
No
1
No
2
dirty filter
No
5
No
Yes
Open the stop valves
Add refrigerant or inspect the system for
Yes
Inspect the system and fix the error. If the
Yes
filter is blocked by ice, the piping should
be cleaned
Yes
Inspect the system and fix the error
V5 X VRF 50/60Hz
leaks
87