LG LSWF388HVS Service Manual ▷ View online
26
Remarks
Result
(tolerance
5%)
At 86
℉
(30
℃
)
At 104
℉
(40
℃
)
At 140
℉
(60
℃
)
At 158
℉
(70
℃
)
At 203
℉
(95
℃
)
At 221
℉
(105
℃
)
39.5 k
Ω
26.1 k
Ω
12.1 k
Ω
8.5 k
Ω
3.8 k
Ω
2.8 k
Ω
Remarks
Result
(tolerance
5%)
At 86
℉
(30
℃
)
At 104
℉
(40
℃
)
At 140
℉
(60
℃
)
At 158
℉
(70
℃
)
At 203
℉
(95
℃
)
At 221
℉
(105
℃
)
At 241
℉
(1
16
℃
)
At 266
℉
(130
℃
)
At 293
℉
(145
℃
)
At 320
℉
(160
℃
)
At 356
℉
(180
℃
)
39.5 k
Ω
26.1 k
Ω
12.1 k
Ω
8.5 k
Ω
3.8 k
Ω
2.8 k
Ω
2.1 k
Ω
1.4 k
Ω
1.0 k
Ω
0.7 k
Ω
0.4 k
Ω
Lamp
Pin1: 16.5 V
Thermistor
Pin4: wash thermistor
Pin6: wash heater
Motor
RD.
pin1: U
pin2: V
pin3: W
NA.
pin1: +
pin2: Hb
pin3: Ha
pin4: GND
Door Switch
NA. pin1: PTC
pin2: PTC
Inlet V
a
lve
NA4.
pin3: main wash
BL.
pin1: common
pin2: AG
valve
NA5.
pin2: pre valve
pin3: bleach
pin4: hot valve
Result
T
est Points
5-15
Ω
5-15
Ω
5-15
Ω
(1) to (2)
(2) to (3)
(3) to (1)
Result
T
est Points
8-12 k
Ω
8-12 k
Ω
10-15 Vdc
10 Vdc
10 Vdc
Remarks
V
oltage Input
Pulsing Signal
Pulsing Signal
(1) to (2)
(1) to (3)
(1) to (4)
(2) to (4)
(3) to (4)
Result
T
est Points
700-1500
Ω
60-90
Ω
Infinity
120 V
a
c
Remarks
At 77
℉
(25
℃
)
At 77
℉
(25
℉
)
V
oltage Input
(2) to (4)
(3) to (4)
(4) to (5)
(2) to (4)
Pump
Drain pump: 10-20
Ω
Circulation pump: 18-30
Ω
Result
T
est Points
0
Ω
0
Ω
WH (1) to RD (3)
WH (3) to RD (1)
Heater:
12 -18
Pin1 to Pin2:
0 -1.2 k
Heater
BL, BK. pin4: V
ac (input)
BL.
pin3: steam generator
heater (input)
BK.
pin3: wash heater (input)
pin3: steam generator/
YL.
wash heater (output)
pin4: V
ac (output)
Ω
Ω
Ω
Ω
AG Sensor
YL.
pin1: GND
pin2: S
pin4: L
Display
pin3: GND
pin4: 12V
pin5: 5V
Pump
BL. pin3: circulation pump
NA. pin1: drain pump
BL. pin3 to NA. pin1
1. Pump running: 120V
5%
2. Stopped Motion Pump: 0-1V
WM3885H*CA
WM3875H*CA
Reference
Part Name
*
The part of this mark is only
for steam models.
8-3. TROUBLESHOOTING SUMMARY
27
INLET VALVE ERROR
When you press both
WASH/RINSE button and
SOIL LEVEL button
simultaneously,
is the water level frequency
below 24.6 kHz?
WASH/RINSE button and
SOIL LEVEL button
simultaneously,
is the water level frequency
below 24.6 kHz?
(Refer to 7-4.)
Is filter inlet valve clogged
with foreign material?
with foreign material?
Is the connector connected to
inlet valve assembly
disconnected or
disassembled?
inlet valve assembly
disconnected or
disassembled?
Is resistance between
each terminal of INLET
VALVE ASSEMBLY
0.8-1.2 k
each terminal of INLET
VALVE ASSEMBLY
0.8-1.2 k
Ω?
(Refer to 9-5 inlet valve
assembly.)
assembly.)
Clean or
replace the filter.
replace the filter.
Check the AIR
CHAMBER
and the tube
(clogged).
CHAMBER
and the tube
(clogged).
No
No
Yes
Yes
Reconnect or
repair
the connector.
repair
the connector.
Replace the
INLET VALVE
ASSEMBLY.
INLET VALVE
ASSEMBLY.
Yes
Yes
Is
IE ERROR
displayed?
Yes
Is the voltage of the inlet
valve connector 120 V AC?
(Check the all terminal of
valve connector 120 V AC?
(Check the all terminal of
INLET VALVE ASSEMBLY
while the power is on.)
while the power is on.)
Replace the
INLET VALVE
ASSEMBLY.
INLET VALVE
ASSEMBLY.
No
Yes
Is the connector connected to
MAIN PWB assembly
disconnected or dis-
assembled?(NA2, NA4, BL3)
MAIN PWB assembly
disconnected or dis-
assembled?(NA2, NA4, BL3)
Reconnect or
repair
the connector.
repair
the connector.
No
Yes
Yes
Is Electrical connection
correct?
correct?
(Refer to 9-5 wiring diagram)
Replace the
MAIN HARNESS.
MAIN HARNESS.
No
No
After checking connector,
is the water level frequency
below 24.6 kHz?
is the water level frequency
below 24.6 kHz?
(Refer to 7-4.)
Replace the MAIN PWB
ASSEMBLY.
ASSEMBLY.
[Note] Environmental safety check list
1) No water tap leakage
2) No water tap freeze
3) No entanglement of water supply hose
4) No water shortage
5) No shrinkage on water supply hose due to
1) No water tap leakage
2) No water tap freeze
3) No entanglement of water supply hose
4) No water shortage
5) No shrinkage on water supply hose due to
a possible misuse of hot and cold water
6) No water supply hose leakage
Check the
PRESSURE
SWITCH.
PRESSURE
SWITCH.
Yes
No
No
8-4. TROUBLESHOOTING WITH ERROR
28
DRAIN ERROR
Is the connector connected
to pump motor assembly
disconnected or
disassembled?
to pump motor assembly
disconnected or
disassembled?
Reconnect or
repair
the connector.
repair
the connector.
Yes
Circulation pump
Yes
Drain pump
Connection connector
No
Yes
When you press both
WASH/RINSE button and
SOIL LEVEL button
simultaneously, is the
water level frequency
below 25.0 kHz?
WASH/RINSE button and
SOIL LEVEL button
simultaneously, is the
water level frequency
below 25.0 kHz?
(Refer to 7-4.)
Check the AIR
CHAMBER,
the tube
(clogged),
and press
switch.
CHAMBER,
the tube
(clogged),
and press
switch.
Is the coil of the drain
pump too high or low?
(resistance of the coil
is 10-20
pump too high or low?
(resistance of the coil
is 10-20
Ω)
(Refer to 9-4 Pump motor
assembly.)
assembly.)
Replace the
DRAIN PUMP
ASSEMBLY.
DRAIN PUMP
ASSEMBLY.
No
Yes
Is the voltage between
connectors out of range?
(NA2 pin1~ BL3 pin1)
- After remove Terminal
Position Assurance (TPA)
of connector, check as follows.
connectors out of range?
(NA2 pin1~ BL3 pin1)
- After remove Terminal
Position Assurance (TPA)
of connector, check as follows.
- Pump running : 120V±5%
- Stopped Motor/Pump : 0~1V
- Stopped Motor/Pump : 0~1V
Method
1. Press the Power button, while the SPIN SPEED
1. Press the Power button, while the SPIN SPEED
button and SOIL LEVEL button is pressed
simultaneously.
simultaneously.
2. Press Start/Pause button.
: 1 time
Pump slow-speed running
: 2 times
Pump mid-speed running
: 3 times
Pump high-speed running
: 4 times
Stop the Motor/Pump
[Note] Environmental check list
1) The drainage hose must not stay in a lower
1) The drainage hose must not stay in a lower
position.
2) The drainage hose must not be bent or
clogged in any way due to the surrounding
physical configuration.
physical configuration.
3) The drainage hose must not get frozen at all
times.
4) The drainage pump must not have any improper
substance or material inside that may cause
a machine breakdown.
a machine breakdown.
Replace the
MAIN PWB
ASSEMBLY.
MAIN PWB
ASSEMBLY.
Yes
No
Is
OE ERROR
displayed?
29
HEATING ERROR
Is the connector connected to
heater disconnected or
disassembled?
heater disconnected or
disassembled?
Reconnect or
repair
the connector.
repair
the connector.
Yes
Yes
Is Check heater
resistance out of range?
(12~18
resistance out of range?
(12~18
Ω)
(Refer to 9-6 Heater
assembly.)
assembly.)
Replace the
HEATER
ASSEMBLY.
HEATER
ASSEMBLY.
Yes
No
No
Is thermistor resistance
out of range?
(about 39.5 k
out of range?
(about 39.5 k
Ω at 30
°C
)
(Refer to 9-7 thermistor
assembly.)
assembly.)
Replace the
THERMISTOR
ASSEMBLY.
THERMISTOR
ASSEMBLY.
Yes
No
Check the trans of water
infiltration into thermistor
terminal.
- Does the water infiltrate
infiltration into thermistor
terminal.
- Does the water infiltrate
thermistor terminal?
[Note]
Chances that the cause occurs from the
main controller are very little.
Sensing part of the circuit (tE) consists of
only resistors and capacitors.
Chances that the cause occurs from the
main controller are very little.
Sensing part of the circuit (tE) consists of
only resistors and capacitors.
Replace the
THERMISTOR
ASSEMBLY.
THERMISTOR
ASSEMBLY.
Yes
Steam generator heater
Wash heater
Is the connector connected to
thermistor disconnected or
disassembled?
thermistor disconnected or
disassembled?
Reconnect or
repair
the connector.
repair
the connector.
Yes
No
Steam generator thermistor
Wash thermistor
Is
tE ERROR
displayed?
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