Part
6
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Diagnosis and Troubleshooting
ODU stop valves are closed
Compressor top temperature sensor,
discharge pipe temperature sensor
and/or discharge temperature switch
connections on outdoor main PCB are
loose
1
Ensure the sensors and switch are
connected properly
Compressor top temperature sensor
and/or discharge pipe temperature
sensor have short circuited or failed
2
Replace the faulty sensor(s)
Insufficient refrigerant caused by
refrigerant leakage
3
Add refrigerant and inspect the system
for leaks
The system is blocked, caused by crushed
or bent pipe, blocked EEV or dirty filter
4
Inspect the system and fix the error. If the
filter is blocked by ice, the piping should
be cleaned
The indoor load is too large
5
Make sure the combination ratio is less
than 130%
System contains air or nitrogen
6
Flush all refrigerant then vacuum the
system and recharge refrigerant. Add oil
to the system if it leaks
The condenser heat exchange is poor
7
Inspect the system and fix the error
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
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