LG THERMA V AHBW076A0, Service Manual, Page: 88 / 98

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62 Heatsink High error
220-240 V~ heatsink
temperature is over 85°C
1. ODU fan locking
2. Heatsink assembly of PCB assembly 1 condition
abnormal
3. Defect of temperature sensing circuit part defect
of INV PCB(Inverter)
Display
code
Title Cause of error Check point & Normal condition
n
Error Diagnosis and Countermeasure Flow Chart
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
→
Replace PCB(Inverter) if abnormality found
Is assemble condition
of INV PCB(Inverter)
heatsink normal ?
Is PCB(Inverter) temperature
sensing part normal ?
No
No
Yes
Check assemble condition between INV PCB(Inverter)
heatsink and PFC & IPM module
→
Reassemble if
abnormality found
Recheck installation condition
and connection of Heat sink
Yes
<Check the PFCM>
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).