LG MULTI V IV ARNU07GTU 2 Series Service Manual page 129

Error No. Error Type
107＊
Master
1071
Fan DC Link Low
Slave2
Voltage Error
1072
Slave3
1074
n Error Diagnosis and Countermeasure Flow Chart
Is wiring between fan motor
and PCB normal?
Yes
Is DC_Link voltage normal?
Is Fan PCB assembly normal?
Recheck power and
installation condition
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Error Point
Fan PCB DC link voltage supplied
below 380V
No
1. Check DC_Link Wire connection
2. DC_Link
→ Replace wire if abnormality found
No
Measure DC_Link voltage
→ Check Converter PCB if voltage is below 380V
Yes
No
Replace fan PCB assembly
Yes
1. Wrong wiring between Converter PCB and
Fan PCB
2. Fan PCB assembly defect
3. Reactor terminal contact defect
4. DC link terminal wiring/contact defect
5. Bridge diode defect
DC voltage connection
DC Volt connected
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Troubleshooting Guide
Main Reasons
LGE Internal Use Only