LG Floor Standing Air Conditioner Troubleshooting

Only advanced technologies are used in different types of LG air conditioners: from modern inverter compressors and powerful air cleaning and ionization systems to the most advanced LG air conditioner troubleshooting system. Home air conditioners, semi-industry air conditioners, multi division and VRF systems of LG’s line meet the highest calls in terms of technology as well as possession of a modern attractive design.

No cooling and heating operation performed

WHAT TROUBLEDCOMPLAINTSHOW TO CHECKREMEDY
Other parts than the unitElectric supply interrupted
Defective power wiring Cut
of power fuse
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 discovered
by checking the operation
of other equipment.
Repair a switch box and
is relative instrument.
Replacement of fuse
Request a power
supplier to repair
Other parts than the unitToo low voltageMeasure it with a tester.Check the power source.
Use a thick cable if
necessary.
Magnetic switch for
compressor & fan motor
Control point is on
condition of "OFF" due to
trouble.
Make short-circuit, then
measure it with a tester.
Replace it if necessary.
Operating switchTroubled or defective
contactor
Check it with the eyes or
tester.
Repair or replace it.
Protection devicesOpened the contact point
with trouble
Check it with the eyes or
tester.
Discover the trouble
cause and push the rest
button.

Only blowers do not work

WHAT TROUBLEDCOMPLAINTSHOW TO CHECKREMEDY
Air volume change over
switch
Troubled or defective
contact point
Check it with the eyes or a
tester
Repair or replace it
CapacitorDefectedCheck it with a testerReplace it

Only outdoor fan does not work

WHAT TROUBLED COMPLAINTSHOW TO CHECK REMEDY
MotorOver-heated
Layer short
Check how it is insulatedRepair or replace it
Electric WiringOpen wire on operation
Short circuited on
operation
Check it with a testeRewiring or repair

Only compressor does not work

WHAT TROUBLED COMPLAINTSHOW TO CHECK REMEDY
Magnetic switch for
compressor motor
Defective contact,
magnetic coil troubled.
Check it with the eyes on
with a tester.
Repair or replace it.
Compressor motorTroubled over-heated
(layer short)
Check how it is insulated.Replace or repair the
compressor.
CompressorTroubled or over-heated
(lock)
Groaned noise of motorRepair or replace it.
High pressure switchTroubled or defective
contact or operating
Check it with a tester.Replace it if necessary.
Electric circuitDefective connection or
disconnection of the circuit
for compressor.
Check it with a tester.Rewiring or push reset
button.

The Units discontinue after the operation started

WHAT TROUBLED COMPLAINTSHOW TO CHECKREMEDY
Other parts than the unitImproper opening of the
service valves in the
refrigerant line
CheckingOpen it properly
Outdoor coilCoil is dirty *1CheckingWash it by means of
something like chemical
washing.
In-condensable gas
blended.
Air intruded into the
refrigerant pipe line *1
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.
Extract air by vacuum
pump, then recharge the
refrigerant.
High pressure switchImproper adjustmentCheck it with a pressure
gauge.
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.
RefrigerantA shortage of refrigerant
amount. * 2
Recharge the
refrigerant. Repair the
spot where it leaks.
Outdoor FanReverse rotation of fan
Obstacle
Air short circuit *1
Confirm the wind blowing
out.
Check it with eyes.
If reversed, connect
interchanged wires to
each terminal.
Power wirings.

The unit is working, but not cooling and heating sufficiently
(Both blower and compressor are working)

WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY
LoadMuch heat loadHeat load increased.
Window or door has many
cracks or gaps.
Do necessary disposal
respectively.
Air flowObstacle disturbs Intake
of uniform wind.
CheckingCorrect it.
Short air volumeReverse rotation of
blower.
CheckingCorrect it.
RefrigerantShortage in the charged
refrigerant.
Coil inlet pipe is frosted Replenish it.
(Repair the leakage spot)
Air passageImproper or foreign bodiesCheckingCorrect or clear the
foreign bodies.
Air filterClogged with dustCheckingCleaning

All the functions are performed normally, but LG AC very noisily and much vibratively

WHAT TROUBLED COMPLAINTSHOW TO CHECKREMEDY
CompressorLiquid refrigerant flooding
back from the evaporator.
• Check for refrigerant over-charge.
• Check to see if the intaking air temperature is
extremely cold.
• Check for insufficient air flow quantity.
• Check for refrigerant over-charge.
• Check to see if the intaking air temperature is
extremely cold.
• Check for insufficient air flow quantity.
CompressorCompressor shipping
bracket is not removed.
• Checking• Remove the shipping
bracket.
CompressorFaulty discharge valve and
suction valve.
• Checking• Replace the
compressor
BlowerFan broken.
Other materials intruded.
• Checking• Repair or replace it.
• Clear the other
material
ScrewsLooseness or fail-off of
screws
• CheckingRepair
Electric troubles
(Magnetic
contactor)
Defective contact.
Defective contact point.
Rusting and faults in the iron
core contact face. Defective
contact of the
operating switch.
• CheckingRepair and clean or
replace it.
OthersImproper installation• CheckingCorrect it.