LG AMNH096BTG0 Manuals page 200

Troubleshooting Guide
5) Troubleshooting CH21
Display
Title
code
21
DC Peak
Comp
U
V W
Copper
Comp
pipe
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. ¡ Normal : 0.65Ω(INV), 0.8Ω(Cons.) ¡ No difference at each terminal.
5. Check the insulation from water at IPM part. ¡ Check the trace of water.
6. Check the IPM circuit.
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Cause of error
• Instant over current
• Over Rated current
• Poor insulation of IPM
Resistance(Ω) at 20°C
Inverter
Ω Terminal
comp.
U-V 0.64
V-W 0.64
W-U 0.64
Resistance(Ω) at 20°C
Inverter
Terminal
comp.
Ω
U-GND 2MΩ
V-GND 2MΩ
W-GND 2MΩ
- 200 -
Check point & Normal condition
• 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.
• Poor insulation of compressor
Constant
comp.
0.8
0.8
0.8
Constant
comp.
2MΩ
2MΩ
2MΩ
LGE Internal Use Only