DOWNLOAD LG LP-C508T / LP-H508T / LP-Z508T Service Manual ↓ Size: 7.84 MB | Pages: 127 in PDF or view online for FREE

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• There is risk of physical injury, electric shock, or prod-

uct failure.

• There is risk of fire, electric shock, or product damage.

• Low refrigerant levels may cause failure of product.

• A bad connection may cause water leakage.

• There is risk of fire or failure of product.

• There is risk of electric shock or fire.

NAME PLATE RATING

MINIMUM

MAXIMUM

380 V

342 V

418 V

220 V

198 V

242 V

380 - 415 V

342 V

456 V

Other parts than the unit

Magnetic switch for com-
pressor & fan motor 

Operating switch

Protection devices

Electric supply interrupted
Defective power wiring
Cut of power fuse

Too low voltage

Control point is on condi-
tion of "OFF" due to trou-
ble.

Troubled or defective
contactor

Opened the contact point
with trouble

Measure it with a tester in
case that the same
power source is supplied
to other equipment than
the unit, what and where
trouble can be discov-
ered by checking the
operation of other equip-
ment.

Measure it with a tester.

Make short-circuit, then
measure it with a tester. 

Check it with the eyes or
tester.

Check it with the eyes or
tester.

Repair a switch box and
is relative instrument.

Replacement of fuse

Request a power 
supplier to repair.

Check the power source.
Use a thick cable if nec-
essary.

Replace it if necessary.

Repair or replace it.

Discover the trouble
cause and push the rest
button.

Air volume change over
switch

Capacitor

Troubled or defective 
contact point

Defected

Check it with the eyes or a
tester

Check it with a tester.

Repair or replace it.

Replace it.

Motor

Electric Wiring

Over-heated
Layer short

Open wire on operation

Short circuited on 
operation

Check how it is insulated.

Check it with a tester.

Repair or replace it.

Rewiring or repair.

Magnetic switch for
compressor motor

Compressor motor

Compressor

High pressure switch

Electric circuit

Defective contact, 
magnetic coil troubled.

Troubled over-heated 
(layer short)

Troubled or over-heated 
(lock)

Troubled or defective 
contact or operating

Defective connection or
disconnection of the circuit
for compressor.

Check it with the eyes on
with a tester.

Check how it is insulated.

Groaned noise of motor

Check it with a tester.

Check it with a tester.

Repair or replace it.

Replace or repair the
compressor.

Repair or replace it.

Replace it if necessary.

Rewiring or push reset
button.

Note: Use an appropriate measuring instrument for readjustment.

*1:  Check the High-pressure switch indication.

*2: Check the Low- pressure switch indication.

Other parts than the unit

Outdoor coil

In-condensable gas
blended.

High pressure switch

Refrigerant

Outdoor Fan

Improper opening of the
service valves in the
refrigerant line

Coil is dirty *1

Air intruded into the 
refrigerant pipe line *1

Improper adjustment

A shortage of refrigerant
amount. * 2

Reverse rotation of fan 
Obstacle
Air short circuit *1

Checking

Checking

In the event that 
difference between the
saturating temperature
corresponding to high
pressure and the 
temperature of air 
discharged from the 
outdoor coil is more than
15°C, incondensable gas
may be blended.

Check it with a pressure
gauge.

Confirm the wind blowing
out.

Check it with eyes.

Open it properly

Wash it by means of
something like chemical
washing.

Extract air by vacuum
pump, then recharge the
refrigerant.

Readjust it to normal
operating pressure. 
(Note)
Don't alternate the 
specified adjusting 
pressure. If the adjusted
pressure exceeds the
specified range, it will
cause a great accident.

Recharge the 
refrigerant. Repair the
spot where it leaks.

If reversed, connect
interchanged wires to
each terminal. 
Power wirings.