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Only for training and service purposes
Part 4 Trouble Shooting
3) Troubleshooting CH21
Ω
Comp
Copper
pipe
Resistance(Ω) at 20°C(68°F)
Resistance(Ω) at 20°C(68°F)
0.64
0.64
0.64
Inverter
comp.
V-W
W-U
U-V
Terminal
0.8
0.8
0.8
Constant
comp.
2MΩ
2MΩ
2MΩ
Inverter
comp.
V-GND
W-GND
U-GND
Terminal
2MΩ
2MΩ
2MΩ
Constant
comp.
V
U
W
Ω
Comp
21
DC Peak
• Instant over current
• Over Rated current
• Poor insulation of IPM
• 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
Error
code
Title Cause of error Check point & Normal condition
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.