Multi F Four-Way Ceiling Cassette Service Manual

- 63 -

Only for training and service purposes

LGE Internal Use Only

Part 5. Trouble Shooting

Display

code

Title Cause of error Check point & Normal condition

Over-current at the initial

operation of the compres-

sor / location sensing sig-

nal for compressor opera-

tion is not input

• Compressor Locking

• Overload operation

(Outdoor fan constraint,

screened, blocked)

• Burned parts inside

PCB(IPM)

• Burned PCB phase current

sensing circuit parts

• Check compressor locking

• Compressor wire open/short

• Check compressor insulation damage

• Check outdoor fan constraint / screened / flow

structure

• Check if IMP burned (refer to CH21)

• Check on-PCB current sensing circuit parts

5V_GND5V_GND5V_GND

Comp_Current

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.