V6R VRF 50Hz
127
P
art
6
- Di
agno
si
s and
Tr
ou
bles
ho
o
ting
Procedure
P2 / H5
ODU stop valves are closed
Yes
Open the stop valves
No
Insufficient refrigerant caused by
refrigerant leakage
1
Yes
Add refrigerant or inspect the system for
leaks
No
The low pressure side is blocked, caused
by crushed or bent pipe, blocked EEV, or
dirty filter
2
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
3
Yes
Inspect the system and fix the error
No
Replace the outdoor main PCB
4
Notes:
1.
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.
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.
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.
4.
The low pressure sensor connection is port CN16 on the outdoor main PCB.
