LG AH-W096A0 - Concept of Classified Trouble

Troubleshooting Guide
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Only for training and service purposes
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05 Bad communication
between Indoor unit
and Outdoor unit
53
• The connector for transmission is dis-
connected
• The connecting wires are miscon-
nected
• The communication line is broken
• Outdoor PCB is abnormal
• Indoor PCB is abnormal
• Wire connection between control panel
and indoor unit PCB should be tight
Code
No.
Description Cause Normal Condition
Is outdoor PCB LED
blinking?
Yes
Yes
No
Is main circuit breaker off?
No
Check the main power
supply at the ODU
terminal block?
Improper connection of power supply cable
Main power supply problem
Yes
No
Yes
No
Outdoor PCB fault
Replace after checking
Re-connect transmission cable
No
Yes
Indoor PCB fault
Replace after checking
Check the insulation of inverter
Check the capacity of main circuit
breaker and replace if required
If all ok,
Turn on main circuit breaker
Replace outdoor PCB after
checking
Replace TRANS after checking
Check if the
transmission cable is
properly connected
to indoor / outdoor
terminal block?*
Control panel
displays CH05?
Replace indoor unit PCB
Reconnect transmission cable
between indoor unit PCB and
control panel
■ Error diagnosis and countermeasure flow chart
❊ CH05 is displayed at indoor unit,
CH53 is displayed at outdoor unit.