DOWNLOAD LG 40518 Service Manual ↓ Size: 6.67 MB | Pages: 59 in PDF or view online for FREE

8-4. TROUBLESHOOTING WITH ERROR

Is                 displayed?

When you press both
WASH/RINSE button and
DELAY START button
simultaneously,
is the water level < 246?

Is filter inlet valve clogged
with foreign material?

Check the connectors at the
main PCB and the water
valve. Are the connectors
loose or disconnected?

Proceed to next step at right.

Is the resistance of fill valve
coil between 800 and 
1200 

1?

(Refer to 9-5 inlet valve
assembly.)

Clean or
replace the filter.

Check the AIR
CHAMBER
and the tube
(clogged).

Reconnect or
repair
the connector.

Replace the
INLET VALVE
ASSEMBLY.

Is the voltage at the inlet
valve coil 120VAC with the
valve energized?

Replace the
INLET VALVE
ASSEMBLY.

Is the wiring correct? Refer to
the wiring diagram for correct
connections.

(Refer to 9-5 wiring diagram)

Replace the
MAIN HARNESS.

Is the water level still < 246?

Replace the MAIN PWB
ASSEMBLY.

ALWAYS CHECK FOR EXTERNAL CAUSES
Water supply shut off 
Frozen water lines
Kinked fill hose
Low water pressure

Check the
pressure
switch. Refer to
test #2.

Is                 displayed?

Check the connectors at the
main PCB and the drain
pump.  Are the connectors
loose or disconnected?

Reconnect or
repair
the connector.

When you press both
WASH/RINSE button and
DELAY START button
simultaneously, is the
water level <250?

Proceed to next step at right

Check the air
dome and
pressure hose
for clogging.
Check the
pressure
switch.  See
test #2.

Measure the resistance of
the drain pump motor.  Is
the resistance between 10

1

and 20

1 ? 

(Refer to 9-4 Pump motor
assembly.)

Replace the
DRAIN PUMP
ASSEMBLY.

Check the voltage between
the main PCB connectors
NA4-1 BN and BL3-1 BK.  Is
the voltage 120 VAC ± 5%?

1. Turn on the washer

2. Press the SPIN SPEED button to select LOW

speed.

3. Press the START/PAUSE button.

The drain pump will be energized for several

minutes at the beginning of the spin cycle.

ALWAYS CHECK FOR EXTERNAL CAUSES
Kinked or clogged drain hose
Frozen drain hose
Foreign objects clogging the drain pump filter
Foreign objects caught in pump impeller

Replace the
MAIN PWB
ASSEMBLY.

Is                 displayed?

Check the connectors at the
main PCB, the heater and the
thermistor.  Are the
connectors loose or
disconnected?

Reconnect or
repair
the connector.

Check the resistance of the
heater.  Is the resistance
between 12

1 and 181 ? 

(Refer to 9-6 Heater
assembly.)

Proceed to next step at right

Replace the
HEATER
ASSEMBLY.

Is the connector connected to
thermistor disconnected or
disassembled?

Reconnect or
repair
the connector.

Check the thermistor
resistance.  Is the resistance
correct according to the
chart?

(Refer to 9-7 thermistor
assembly.)

Replace the
THERMISTOR
ASSEMBLY.

Are the thermistor terminals
dry and free of corrosion?

Replace the
THERMISTOR
ASSEMBLY.

Is                 displayed?

Check the connectors at the
main PCB and the main
motor.  Are the connectors
loose or disconnected?
Main PCB connectors RD3
and NA4
Motor connectors to stator and
hall sensor

Reconnect
the connector.
(connector /
wire / motor )

Replace
the ROTOR.

Is rotor magnet cracked?

Magnet

Replace
the STATOR.

Check the resistance of the
stator winding from the main
PCB connector RD3.  Is the
resistance between each
pair or wires between 5  and
15 ? (Measure pins 1-2, 1-3
and 2-3.) 

Replace
the Hall
sensor.

Is hall sensor out of
order? 

(Refer to 9-3

Stator assembly/Hall
sensor.)

Replace the
MAIN PWB
ASSEMBLY.

Check the IPM in the
controller.