4Way Valve - LG multi V PLUS Service Manual

Fault diagnosis and Trouble shooting guide
Error
Error Item
Display No.

4way valve

151
Trouble shooting Flow
During backup operation?
Are all sub units recognized
when applying power?
4way valve connector 220V during
4way valve normal?
Is operation sound of 4way
valve solenoid heard?
between high and low pressure more
than 3.5kg when operating?
Replace the 4way valve.
Meaning
Switch-over failure of
4way valve
Start of check.
Yes
Yes
Is the voltage of
heating mode?
Yes
Are coils of the
Yes
Yes
Is there difference
Yes
Major Error Occurrence Cause
• Locking of 4way valve by foreign material,
aging, etc.
• Poor coils
• Applied voltage of PCB is poor.
Yes
Retry after releasing
backup operation.
Retry after checking
No
communication lines or
dip switch setup of
main and sub unit.
No
Replace PCB.
No
Replace coils part.
No
Replace the 4way valve.
No
Replace the 4way valve.
Self-diagnosis function
Service Manual 285