LG Multi V

Troubleshooting Guide
- 102 -
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Only for training and service purposes
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1. Wrong operation of 4way valve because of sludge
etc. inflow
2. No pressure difference because of compressor
fault
3. Wrong installation of In/outdoor common pipe
4. Defect of 4way valve
Error
No.
Error Type Error Point Main Reasons
Function error of 4way
(reversing valve) in Main
Function error of outdoor
4way (reversing valve)
151
■ Error diagnosis and countermeasure flow chart
Is 4-Way valve connecter
connection are properly
connected?
No
Reconnect it
After reset, check if output voltage
when starting heating
is coming out from main PCB
4way output terminal(CN09)
mode operation***
Is 4 way valve coil connected
to 4 way valve normally?**
No
Is 4 Way valve coil
resistance normal?*
Change 4 Way valve coil
No
Yes
Is compressor working
normally?
No
Check and replace compressor,
Magnet switch, corresponding PCB
[refer electric component part]
Yes
Re-insert 4 way valve coil
Replace outdoor unit PCB
Yes
Yes
No
Replace 4 way valve
After opposite
mode operation to present
mode, is the same error
occurred again?
If the same error is occurred in
near future replace 4way valve
Yes
Yes
No