LG ATNH126ELFC Service Manual page 106

Troubleshooting Guide
Electronic Parts Troubleshooting Guide
The Product doesn't operate at all.
Trouble 1
Does the Operating LED of indoor unit blink
When Operation's ON?
Is the Connection between CN-POWER of indoor
unit and terminal block?
Is the Connection of cable between indoor and
Outdoor unit right?
Is the voltage of CN-POWER in outdoor
PCB ASS'Y about AC220/240V?
Check the Fuse of outdoor PCB Ass'y.
Check the connecting state of wires
Check the Auto Addressing Work
Replace the PCB Ass'y
* The product's operation starts at three minutes after main power turning on
106 Synchro Air Conditioner
Turn off the main power and wait until LED on outdoor PCB is off
Turn on the main power again.
Refer to the self-diagnosis function.
Check the connecting state of connector
Check the diagram wiring on the control panel
Check the main power.
Confirm Auto Addresssing work method