LG Multi-Inverter Service Manual page 99

4. Trouble Shooting
Display
Title
code
65
Heatsink High error
I Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal ?
Yes
Is assemble condition
of INV PCB heatsink normal ?
Yes
Is PCB temperature
sensing part normal ?
Check Point
1. Check resistance between No.19 pin and NO.20 pin of PCB PFC module
2. Check resistance between No.24 pin and NO.25 pin of PCB PFC module - only 48/56k
3. Resistance value should be in 7kΩ ±10%.(at 25°C).
4. Check the PFC Module No.19, 20 and IPM Module No.24, 25 pin soldering condition.
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Only for training and service purposes
Cause of error
Inverter PCB heatsink
sensor is open or short
1. Check fan locking
2. Check covering of heat exchanger
3. Check distance between ODU and obstacles
No
4. Check pipe distortion and abnormality
5. Check service valve is opened
¡ Eliminate causes for abnormal condition
Check assemble condition between INV PCB heatsink and
No
PFC & IPM module
¡ Reassemble if abnormality found
Check resistance between NO.19 pin and NO.20 pin
of PFC module
No
Check resistance between NO.24 pin and NO.25 pin
of PFC module
¡ 7KΩ ±10%(at 25°C)
¡ Replace PCB if abnormality found
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Check point & Normal condition
1. ODU fan locking
2. Heatsink assembly of INV PCB assemble
condition abnormal
3. Defect of temperature sensing circuit part defect
of INV PCB
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