V6R VRF 50Hz
133
P
art
6
- Di
agno
si
s and
Tr
ou
bles
ho
o
ting
Procedure
P4 / H6
ODU stop valves are closed
Yes
Open the stop valves
No
Compressor top temperature sensor,
discharge pipe temperature sensor
and/or discharge temperature switch
connections on outdoor main PCB are
loose
1
Yes
Ensure the sensors and switch are
connected properly
No
Compressor top temperature sensor
and/or discharge pipe temperature
sensor have short circuited or failed
2
Yes
Replace the faulty sensor(s)
No
Insufficient refrigerant caused by
refrigerant leakage
3
Yes
Add refrigerant and inspect the system
for leaks
No
The system is blocked, caused by crushed
or bent pipe, blocked EEV or dirty filter
4
Yes
Inspect the system and fix the error. If the
filter is blocked by ice, the piping should
be cleaned
No
The indoor load is too large
5
Yes
Make sure the combination ratio is less
than 130%
No
System contains air or nitrogen
6
Yes
Flush all refrigerant then vacuum the
system and recharge refrigerant. Add oil
to the system if it leaks
No
The condenser heat exchange is poor
7
Yes
Inspect the system and fix the error
No
Replace the outdoor main PCB
Notes:
1.
Compressor top temperature sensor and discharge pipe temperature sensor connections are ports CN4 on the outdoor main PCB. The discharge temperature
switch connection is port CN18 on the outdoor main PCB.
2.
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
