Multi F Four-Way Ceiling Cassette Service Manual

ManualsBrandsLG ManualsCoolingCeiling Cassette 2-Zone LGRED° Heat System - 18,000 BTU Outdoor - 7k + 7k Indoor - 21 SEER

- 62 -

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 on AC → DC

converter circuit

• Overload operation

(Outdoor fan constraint,

screened, blocked)

• Wrong application of

Reactor Spec.

• Burned PCB internal

parts (PSC Module)

• Check outdoor fan constraint/ screened/ flow

structure

• Check Reactor Spec: 11A/ 13mH

• Check for PCB internal part burn

• Inspecting PCB IGBT part

1. Remove the connectors to the PCB.

2. Set Multi-tester as Resistance

measurement mode

3. Measure Resistance of Gate-collector,

Emitter-collector.

4. If the measurements are 1MΩ

↓

the parts are decided as burned.

Is the unit properly

installed?

• Check fan locking

• Remove blockings around heat exchanger

• Maintain distance between outdoor unit

and the wall

• Check pipe folding and abnormality

• Check service valve lock

• Remedy : remove cause of error

• Remedy : replace reactor.

• Remedy : replace PCB Assembly.

• Check Reactor spec:1 1A/13mH

• Check IGBT part

resistance measurements

at power-on standby state

→ 100Ω ↑

Is the reactor

normal?

Is IGBT Part

is normal?

IGBT

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.