LG ATNH126ELFB Service Manual page 73

Troubleshooting Guide
When Vertical Louver does not operate
Trouble 6
• Confirm that the Vertical Louver is normally geared with the shaft of
Stepping Motor.
• If the regular torque is detected when rotating the Vertical Louver with
hands
• Check the connecting condition of CN-U/D Connector
• Check the soldering condition(on PWB) of CN-U/D Connector
• Confirm that there is DC + 12V between pin
GND.
• Confirm the assembly conditions that are catching and interfering parts
in the rotation radial of the Vertical Louver
118 Synchro Air Conditioner
Normal
Check the operating circuit of the Vertical Louver
If there are no problems after above checks
(RED) of CN-U/D and