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Part 5. Trouble Shooting
- 87 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
65
Heatsink Sensor error
Inverter PCB heatsink
sensor is open or short
1. ODU fan locking
2. Heatsink assembly of INV PCB assemble
condition abnormal
3. Defect of temperature sensing circuit part defect
of INV PCB
Display
code
Title Cause of error Check point & Normal condition
Is installation
condition normal ?
No
Yes
1. Check fan locking
2. Check covering of heat exchanger
3. Check distance between ODU and obstacles
4. Check pipe distortion and abnormality
5. Check service valve is opened
→ Eliminate causes for abnormal condition
Check resistance between NO.19 pin and NO.20 pin
of PFC module
Check resistance between NO.24 pin and NO.25 pin
of PFC module
→ 7KΩ 10%(at 25°C)
→ Replace PCB if abnormality found
Is assemble condition
of INV PCB heatsink normal ?
Is PCB temperature
sensing part normal ?
No
No
Yes
Check assemble condition between INV PCB heatsink and
IGBTM Module
→ Reassemble if abnormality found
Recheck installation condition
and connection of Heat sink
Yes
n Error Diagnosis and Countermeasure Flow Chart
Check Point
1. Check resistance between No.19 pin and NO.20 pin of PCB PFC module
2. Resistance value should be in 7kΩ ±10%.(at 25°C).
3. Check the PFC Module No.19, 20.
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