10.3.3.15 Outdoor compressor lack phase protection(PC43)
Check the compressor three-
phase output for obvious
open circuit
Power off,then restart the unit
2 minutes later.Is it still
displaying the error code
The unit operates
normally
Check both ends of
compressor connecting
line .Are all the connections
good?
Correct the connections
Check whether the three-
phase resistance of the
compressor is symmetrical
Replace the compressor
Yes
Yes
Yes
No
No
No
Replace the main PCB
No
Trobule is solved
Yes
10.3.3.16 Outdoor unit IR chip drive failure(PC45)
Power off,then restart the unit
2 minutes later.
Replace the inverter module
PCB.
Yes
10.3.3.17 The cooling operation or heating operation does not operate.
● Faulty 4-way valve
Check of 4-way, please refer to part 4 in 10.4 Trouble Criterion Of Main Parts.
10.3.3.18 When cooling, heat exchanger of non-operating indoor unit frosts.
When heating, non-operating indoor unit get warm.
● Faulty EXV
● Wire and piping connected in reverse.
Check of EXV, please refer to part 5 in 10.4 Trouble Criterion Of Main Parts.
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