Multi F Four-Way Ceiling Cassette Service Manual

- 58 -

Only for training and service purposes

LGE Internal Use Only

Part 5. Trouble Shooting

Display

code

Title Cause of error Check point & Normal condition

AC Input current is higher

than the limit.

• Input voltage error(low

voltage)

• Over load operation

(Outdoor fan constraint,

screened, blocked)

• Burned parts inside PCB

• Check input voltage

• Check outdoor fan canstraint / screened / flow

structure

• Check PCB current sensor parts

5V_GND5V_GND5V_GND

DC_LINK

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.