LG 31412 Service Manual ▷ View online
45
5-4. PUMP MOTOR ASSEMBLY
Wiring
diagram
Test
points
and
Result
Circuit in the MAIN PCB
Wiring Diagram
(1) (2)
Result
10.9 Ω±5%
Remarks
Resistance
Test Points
(1) to (2)
46
5-5. INLET VALVE ASSEMBLY
Wiring
diagram
Function
Test
points
and
Result
Circuit in the MAIN PCB
Wiring diagram
INLET VALVE
Inlet valve driving circuit
Test
Points
Result
(1)-(2)
24±10% [Ω]
Depending on the cycle and water temperature, the controller will energize the hot or cold water
valve solenoids to meet the selected water temperature.
After unplugging the connector of the defective valve, check the resistance.
(1) (2)
(2)
(2)
(2)
(2)
(1)
(1)
(1)
(1)
* All valves operate at 13.5 VDC.
47
5-6. HEATER ASSEMBLY
Wiring
diagram
Function
Test
points
Result
Circuit in the MAIN PCB
Wiring diagram
Test Points
(1) to (2)
Result
12-18 Ω
1. The wash heater is designed to raise the wash water to the desired temperature selection during
certain wash cycles.
2. The steam generator heater is designed to make the water to the steam during steam cycles.
Heater driving circuit
WASH
HEATER
Wash Heater
Wash Heater
(1)
(2)
48
5-7. THERMISTOR ASSEMBLY
Wiring
diagram
Function
Test
points
Circuit in the MAIN PCB / Wiring Diagram
Wash Thermistor
The thermistor (temperature sensor) is used to monitor water temperature in the tub.
MAIN PCB
(2)
(1)
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