LG LP-F8081ZL Service Manual ▷ View online
–40–
Failures to Start
Check of circuit breaker
and fuse.
and fuse.
Check control switch.
Fan only fails to start
Improper wiring
Defect of fan motor
capacitor.
capacitor.
Irregular motor
resistance
resistance
(
Ω
)
Irregular motor
insulation
insulation
(
Ω
)
Replacement of fan motor.
Improper electric heater
Replacement of electric
heater
heater
Regular but fails to start.
Replacement of compressor
Electric heater is not energized
Loose terminal connection.
Improper wiring
Irregular motor resistance
(
Ω
)
Irregular motor insulation
(
Ω
)
Replacement of compressor
Drop of power voltage
Capacitor check
Replacement
Compressor only fails to
start
start
Defect of compressor
capacitor
capacitor
Check power source.
Check control switch
setting.
setting.
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PACKAGE AIR CONDITIONER VOLTAGE LIMITS
8.1 No cooling and heating operation performed
1) Both the blower and the compressor do not work
NAME PLATE RATING
MINIMUM
MAXIMUM
380 - 415 V
342 V
456 V
2) Only blowers do not work
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Other parts than the unit
Magnetic switch for
compressor & fan motor
compressor & fan motor
Operating switch
Protection devices
Electric supply interrupted
Defective power wiring
Cut of power fuse
Defective power wiring
Cut of power fuse
Too low voltage
Control point is on
condition of "OFF" due to
trouble.
condition of "OFF" due to
trouble.
Troubled or defective
contactor
contactor
Opened the contact point
with trouble
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 discovered by
checking the operation of
other equipment.
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.
Measure it with a tester.
Make short-circuit, then
measure it with a tester.
measure it with a tester.
Check it with the eyes or
tester.
tester.
Check it with the eyes or
tester.
tester.
Repair a switch box and
is relative instrument.
is relative instrument.
Replacement of fuse
Request a power
supplier to repair.
supplier to repair.
Check the power source.
Use a thick cable if
necessary.
Use a thick cable if
necessary.
Replace it if necessary.
Repair or replace it.
Discover the trouble
cause and push the rest
button.
cause and push the rest
button.
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Air volume change over
switch
switch
Capacitor
Troubled or defective
contact point
contact point
Defected
Check it with the eyes or a
tester
tester
Check it with a tester.
Repair or replace it.
Replace it.
–42–
3) Only outdoor fan does not work
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Motor
Electric Wiring
Over-heated
Layer short
Layer short
Open wire on operation
Short circuited on
operation
operation
Check how it is insulated.
Check it with a tester.
Repair or replace it.
Rewiring or repair.
4) Only compressor does not work
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Magnetic switch for
compressor motor
compressor motor
Compressor motor
Compressor
High pressure switch
Electric circuit
Defective contact,
magnetic coil troubled.
magnetic coil troubled.
Troubled over-heated
(layer short)
(layer short)
Troubled or over-heated
(lock)
(lock)
Troubled or defective
contact or operating
contact or operating
Defective connection or
disconnection of the circuit
for compressor.
disconnection of the circuit
for compressor.
Check it with the eyes on
with a tester.
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.
compressor.
Repair or replace it.
Replace it if necessary.
Rewiring or push reset
button.
button.
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Note: Use an appropriate measuring instrument for readjustment.
*1: Check the High-pressure switch indication.
*2: Check the Low- pressure switch indication.
8.2 The Units discontinue after the operation started
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Other parts than the unit
Outdoor coil
In-condensable gas
blended.
blended.
High pressure switch
Refrigerant
Outdoor Fan
Improper opening of the
service valves in the
refrigerant line
service valves in the
refrigerant line
Coil is dirty *1
Air intruded into the
refrigerant pipe line *1
refrigerant pipe line *1
Improper adjustment
A shortage of refrigerant
amount. * 2
amount. * 2
Reverse rotation of fan
Obstacle
Air short circuit *1
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.
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.
gauge.
Confirm the wind blowing
out.
out.
Check it with eyes.
Open it properly
Wash it by means of
something like chemical
washing.
something like chemical
washing.
Extract air by vacuum
pump, then recharge the
refrigerant.
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.
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.
refrigerant. Repair the
spot where it leaks.
If reversed, connect
interchanged wires to
each terminal.
Power wirings.
interchanged wires to
each terminal.
Power wirings.
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