During backup operation?
Start of check.
Retry after releasing
backup operation.
Replace the 4way valve.
Yes
No
Replace PCB.
No
Replace coils part.
No
Replace the 4way valve.
No
Yes
Are all sub units recognized
when applying power?
Yes
Is the voltage of
4way valve connector 220V during
heating mode?
Yes
Are coils of the
4way valve normal?
Yes
Replace the 4way valve.
No
Is operation sound of 4way
valve solenoid heard?
Yes
Is there difference
between high and low pressure more
than 3.5kg when operating?
Yes
Trouble shooting Flow
Fault diagnosis and Trouble shooting guide
151
Error Item
Error
Display No.
Major Error Occurrence CauseMeaning
4way valve Switch-over failure of
4way valve
• Locking of 4way valve by foreign material,
aging, etc.
• Poor coils
• Applied voltage of PCB is poor.
Retry after checking
communication lines or
dip switch setup of
main and sub unit.
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