LG ATNH126ELFC Service Manual page 120

Troubleshooting Guide
Troubleshooting CH26, CH27
Display
Title
code
DC Compressor
26
Position
PSC Fault
27
Check Point
• CH 26
1. Check the connection of "U,V,W"
2. Check the insulation of IPM part.
3. Check the compressor. (same with CH21)
120 Synchro Air Conditioner
Cause of error
• Compressor
position detect error
• Over current at "IGBT"
B
• CH 27
1. Check the component of "IGBT"
2. Check the components
(IGBT, R04S, NF1, BD02S)
Check point & Normal condition
• Check the connection of comp wire "U,V,W"
• Malfunction of compressor
• Check the component of "IPM", detection parts.
• Check the component of "IGBT" .
• Check the components.
E E
C C
B B
C
E