DOWNLOAD LG WM3988HMA / WM3988HWA Service Manual ↓ Size: 8.73 MB | Pages: 67 in PDF or view online for FREE

Model
WM3988HMA WM3988HWA
Pages
67
Size
8.73 MB
Type
PDF
Document
Service Manual
Brand
Device
Washing Machine
File
wm3988hma-wm3988hwa.pdf
Date

LG WM3988HMA / WM3988HWA Service Manual ▷ View online

20
7-3. HOW TO READ THE DISPLAY IN LOAD TEST MODE
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RPM
Water level
frequency
Wash temperature
7-4. HOW TO CHECK THE WATER LEVEL FREQUENCY 
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The digits indicate the water level frequency.
* Press the WASH/RINSE and SOIL LEVEL button simultaneously.
For example, if the display indicate 058,
the water level frequency is 20+(58 X 0.1) = 25,8 kHz.
Duct temperature
Steam temperature
Fan Motor RPM
21
If you press the START/PAUSE button when an error is displayed, any error except         will disappear
and the machine will go into the pause status.
In case of         ,         ,         if the error is not resolved within 20 seconds, or the in case of other errors,
if the error is not resolved within 4 minutes, power will be turned off automatically and the error code
will blink. But in the case of         , power will not be turned off.
8-1. SAFETY CAUTION
There’s built-in AC 120V and DC power in output terminal of PWB assembly in common. Be careful
electric shock when disconnecting parts while trouble shooting. (Wear Electro Static Discharge gloves
when working.)
After cutting off the power when changing PWB assembly, disconnect or assemble.
Be careful static when handling PWB assembly, and use Electro Static Discharge plastic pack when
delivering or keeping it.
ERROR
SYMPTOM
CAUSE
WATER INLET
ERROR
• Correct water level (24.6kHz) is not reached within 
8 minutes after water is supplied or it does not reach
the preset water level within 25 minutes.
1
UNBALANCE
ERROR
• The load is too small.
• The appliance is tilted.
• Laundry is gathered to one side.
• Non distributable things are put into the drum.
2
DRAIN ERROR
• Not fully drained within 10 minutes.
3
OVERFLOW ERROR
• Water is overflowing. 
(water level frequency is over 21.3kHz).
If           is displayed, the drain pump will operate 
to drain the water automatically.
4
PRESSURE SENSOR
ERROR
• The PRESSURE SENSOR ASSEMBLY is out of
order.
• When water level frequency maintain condition of
below 10 kHz and over 30 kHz.
5
DOOR OPEN ERROR
• Door not all the way closed.
• Loose electrical connections at Door switch and
PWB Assembly.
• The DOOR SWITCH ASSEMBLY is out of order.
6
HEATING ERROR
• The THERMISTOR is out of order.
7
8. TROUBLESHOOTING
8-2. ERROR MODE SUMMERY
22
ERROR
SYMPTOM
CAUSE
LOCKED MOTOR
ERROR
EEPROM ERROR
• The connector (3-pin, male, white) in the MOTOR
HARNESS is not connected to the connector (3-pin,
female, white) of STATOR ASSEMBLY.
• The electric contact between the connectors (3-pin,
male, white) in the MOTOR HARNESS and 4-pin,
female, white connector in the MAIN PWB
ASSEMBLY is bad or unstable.
• The MOTOR HARNESS between the STATOR
ASSEMBLY and MAIN PWB ASSEMBLY is cut
(open circuited).
• The hall sensor is out of order/defective.
8
• EEPROM is out of order.
Displayed only when the START/PAUSE button is
first pressed in the Load Test Mode.
9
POWER FAILURE
• After the power supply is stopped while washing
machine is working, the power is supplied rapidly. 
10
DRY HEATING 
ERROR
• The connector (3-pin, male, white) in the FAN
MOTOR HARNESS  is not connected to the
connector(3-pin, female, white) of FAN MOTOR
ASSEMBLY.
• The electric contact between the connectors (3-pin,
male, yellow) in the FAN MOTOR HARNESS and
(3-pin, female, yellow) connector in the MAIN PWB
ASSEMBLY is bad or unstable.
• The MOTOR HARNESS between the FAN
MOTOR ASSEMBLY and MAIN PWB ASSEMBLY
is cut (open circuited).
11
23
8-3. TROUBLESHOOTING SUMMARY
Remark
Result
(tolerance 
5%)
At 86
 (30
)
At 104
 (40
)
At 140
 (60
)
At 158
 (70
)
At 203
 (95
)
At 221
 (105
)
39.5 k  
26.1 k 
12.1 k 
8.5 k
3.8 k 
2.8 k 
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  
26.1 k 
12.1 k 
8.5 k
3.8 k 
2.8 k 
2.1 k 
1.4 k 
1.0 k 
0.7 k 
0.4 k 
Lamp
RD Pin1 to Pin3: 16.5 V
Fan Motor
Pin1 to Pin2 / Pin2 to Pin3: 0.8~1.2
Thermistor
Pin3: Dry thermistor
Pin4: W
ash thermistor
Pin6: AG 
thermistor
Motor
Hall Sensor
RD
Pin1: U
Pin2: V
Pin3: W
NA
Pin1: +
Pin2: Hb
Pin3: Ha
Pin4: GND
Door Switch
NA
 Pin1: PTC
Pin2: PTC
Inlet V
alve
NA_
Pin3: Main wash
BL3
BL4
Pin1: Common
Pin2: Pre wash
Pin3: Bleach
Pin4: Hot valve
Result
T
est Points
8~12 k 
8~12 k
10~15 Vdc
10 Vdc
10 Vdc
Remark
V
oltage Input
Pulsing signal
Pulsing signal
Pin1 to Pin2
Pin1 to Pin3
Pin1 to Pin4
Pin2 to Pin4
Pin3 to Pin4
Result
T
est Points
700~1500 
60~90 
Infinity
120 V
a
c
Remark
At 77
(25
)
At 77
(25
)
V
oltage Input
Pin2 to Pin4
Pin3 to Pin4
Pin4 to Pin5
Pin2 to Pin4
steam generator
Result
T
est Points
WH Pin1 to RD Pin3
WH Pin3 to RD Pin1
YL
 Pin1 to WH Pin3
YL
 Pin2 to WH Pin1
AG / W
ASH Heater: 
12 ~18 
Dry Heater: 
Pin1 to Pin2: 
0.8~1.2
Heater 
WH, BL, BK, pin1: V
ac (input)
BL, pin2 
: steam generator
WH, pin2 
: dry heater (input)
heater (input)
BK,
pin2: wash heater (input)
pin2: steam generator/
YL,
wash heater /
dry heater (output)
pin1: V
ac (output)
10~40 
AG Sensor
YL,
pin1: GND
pin2: S
pin4: L
Pump 
BL3 Pin3: Circulation pump
BL4 Pin1: Drain pump 
      BL4, pin1 to BL3 pin3
1. Pump running: 120V 
5%
2. Stopped Motor/Pump: 0 ~ 1V
Result
T
est Points
10-20 
18-30 
(1) to (2)
(1) to (2)
Result
T
est Points
5~15
5~15
5~15
Pin1 to Pin2
Pin2 to Pin3
Pin3 to Pin1
Steam generator Thermistor
W
ash / Dry thermistor
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