Multi F Four-Way Ceiling Cassette Service Manual

Part 5. Trouble Shooting

- 70 -

Only for training and service purposes

LGE Internal Use Only

Display

code

Title Cause of error Check point & Normal condition

If the data transmitted by

the indoor unit is not

received for 3 minutes

continuously.

• No power on indoor unit

• Indoor/outdoor unit

Power connection

error/communication

error caused by external

noise

• Indoor/outdoor unit com-

munication circuit parts

burned

• Check indoor unit power status

• Check indoor/outdoor unit

power/communication line disconnection

• Check the status of indoor/outdoor unit ground

connections

• Check if outdoor unit communication parts are

burned

Recheck power

and installation condition

Yes

WARNING

Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state

of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.