LG MULTI V M ARNU07GTU 4 Series Svc Manual page 83

Error No. Error Type
671
Fan Lock Error
n Error Diagnosis and Countermeasure Flow Chart
Is Heat Exchanger Module Fan
Motor Assemble condition
normal?
Yes
Is Heat Exchanger Module
Fan Motor normal?
Yes
Is wire connection of
Heat Exchanger Module
Fan Motor wire normal?
Yes
Is Inv. PCB assembly normal?
Yes
Recheck power and installation condition
* Sub PCB
Error Point
Fan RPM is 10RPM or less
for 5 s when Heat
Exchanger Module fan
starts or 40 RPM or less
after fan starting.
Check Heat Exchanger Module Fan Motor assemble
No
condition and fan locking → Reassemble or replace if
abnormality found
1. Check resistance between each phase(U,V,W) of Heat
Exchanger Module fan motor terminal (16.8
No
75°...)
2. Check insulation resistance between Heat Exchanger
Module fan motor terminal(U,V,W) → Replace fan motor
if abnormality found
Check wiring between Heat Exchanger Module fan motor
No
and Heat Exchanger Module Sub PCB (Check if and Motor
output terminal color is matched)
No
Replace Heat Exchanger Module Sub PCB assembly
- 83 -
Troubleshooting Guide
Main Reasons
1. Fan motor defect / assembly condition
abnormal
2. Wrong connection of fan motor connector
3. Reversing rotation after RPM target apply
4. Heat Exchanger Module Sub PCB
assembly defect
Ω
±5% at
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