Ceiling Cassette & High Static Ducted Indoor & Outdoor Units

Part 4 Trouble Shooting
- 57 -
Copyright ©2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
n AUUW36GD2[LUU367HV] / AUUW42GD2[LUU427HV]
AC(N)-BLUE
AC(L)-BROWN
UVW
U,V,W CONNECTOR
1. Wait until inverter PCB DC voltage is discharged after main power off.
2. Pull out AC(L), AC(N) connectors and U,V,W COMP Connector.
3. Set multi tester to resistance mode.
4.
If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged)
5. Set the multi tester to diode mode.
6. In case measured value is different from the table, PCB needs to be replaced.(PCB damaged).
27 26 25 24 23 22 21
P W V U Nw Nv Nu P W V U Nw Nv Nu
0.4 ~ 0.6 V
27 26 25 24 23 22 21
0.4 ~ 0.6 V
PFC_IPM check
U, V, W ‘ R S T