V5 X VRF 50/60Hz
201608 87
Part 5 - Diagnosis and Troubleshooting
Procedure 4.17.4
ODU stop valves are closed
Insufficient refrigerant caused by
refrigerant leakage
1
Add refrigerant or inspect the system for
leaks
The low pressure side is blocked, caused
by crushed or bent pipe, blocked EXV, or
dirty filter
2
Inspect the system and fix the error. If the
filter is blocked by ice, the piping should
be cleaned
The evaporator heat exchange is poor
5
Inspect the system and fix the error
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.
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