LG MULTI V M ARNU07GTU 4 Series Svc Manual page 82

Troubleshooting Guide
Error No. Error Type
Compressor module
liquid pipe (condenser)
651
temperature sensor
error
n Error diagnosis and countermeasure flow chart
Is temperature sensor
connector connections
are normal?
Yes
Is the value of temperature
sensor resistance normal?*
Yes
Replace Compressor module
PCB
* Sensor resistance 100 kΩover (open) or 100 Ω below (short) will generate error
Note: Temperate sensor resistance vary with temperature, So compare temperature sensor resistance value
according to Compressor module temperature by referring below table (±5% tolerance)
Air temperature sensor: 10°C = 20.7kΩ : 25°C = 10kΩ : 50°C= 3.4kΩ
Pipe temperature sensor: 10°C = 10kΩ : 25°C = 5kΩ : 50°C= 1.8kΩ
Error Point
Abnormal sensor
resistance value
(Open/Short)
No
Check and correct connection
No
Replace sensor
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Main Reasons
1. Defective temperature sensor connection
2. Defective temperature sensor (Open / Short)
3. Defective Compressor module PCB
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