LG A12AHB, Owner'S Manual

20 Room Air Conditioner

Troubleshooting Tips! Save time and money!

The air conditioner may be operating abnormally when:

Problem

■

The air conditioner is
unplugged.

■

The fuse is blown/circuit
breaker is tripped.

■

Power failure.

■

High voltage.

■

Airflow is restricted.

■

The air filter is dirty.

■

The room may have been hot.

■

Cold air is escaping.

■

Check the temperature settings.

■

There might be any heating 
source in the room.

Air
conditioner
does not start

Air
conditioner
does not cool
as it should

• Make sure the air conditioner plug is

pushed completely into the outlet.

• Check the house fuse/circuit breaker box

and replace the fuse or reset the breaker.

• If power failure occurs, turn the mode

control to OFF. 
When power is restored, wait 3 minutes to
restart the air conditioner to prevent
tripping of the compressor overload.

• If the voltage is unusually very high or low

the circuit Breaker will trip. 

• Make sure there are no curtains, blinds, or

furniture blocking the front of the air
conditioner.

• Clean the filter at least every 2 weeks.

See the Maintenance and Service section.

• When the air conditioner is first turned on,

you need to allow time for the room to cool
down.

• Check for open furnace floor registers and

cold air returns.

• Make sure they are correct.

• Check and remove such source or turn it

off while using the air conditioner.

What To Do

Possible Causes

1. Anything abnormal such as burning smell, loud noise etc. happen. Stop the unit and

turn the breaker off. Never try to repair by yourself or restart the system in such cases.

2. Main power cord is too hot or damaged.

3. Error code is generated by self diagnosis.

4. Water leaks from indoor unit even if the humidity is low.

5. Any switch, breaker (safety, earth) or fuse fails to work properly

User must carry routine checkup & cleaning to avoid unit’s poor performance. 
In case of special situation, the job must be carried out by service person only.

Call the service immediately in the following situations

Maintenance and Service