LG AMNH076LQL0 Service Manual page 181
Multi type air conditioner
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- Service manual (249 pages) ,
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- Product data (78 pages)
Table of Contents
5) Troubleshooting CH21
Display
Title
code
DC PEAK
(IPM Fault)
21
Comp
U
V
W
Comp
Check Point
1. Check the wire connection. (U,V,W)
2. Check the load condition. (Refrigerant, Pipe length, ...) Adjust the load condition
3. Check the electricity leakage of the compressor. Normal : Over 2MΩ.
4. Check the resistance of compressor.
5. Check the IPM circuit.(Continue next page)
Cause of error
• Instant over current
• Over Rated current
• Poor insulation of IPM
Terminal
Ω
U-V
V-W
W-U
Copper
pipe
Terminal
Ω
• An instant over current in the U,V,W phase
- Comp lock
- The abnormal connection of U,V,W
• Over load condition
- Overcharging of refrigerant
Pipe length.
Outdoor Fan is stop
• Poor insulation of compressor
Resistance(Ω) at 20°C
5KD240XBA
1.843
1.893
1.812
Resistance(Ω) at 20°C
Inverter Comp.
U-GND
V-GND
W-GND
Troubleshooting Guide
Check point & Normal condition
5JD420XBB
1.08
1.12
1.09
2MΩ
2MΩ
2MΩ
Service Manual 187
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Troubleshooting
