LG WM3001HRA Training Manual page 96

TRAINING MANUAL
Water Level Sensor
The steam generator heater is shown on the previous page. The heater operates on
120 V @ 1,100 watts, drawing approximately 9 amps. The wiring shows a GRAY wire
AC
(L1) and a RED wire (Neutral.)
When STEAM is selected or a TUB CLEAN cycle is selected, the control board will verify
the water level, add water via the cold valve if needed, and then energize the heater.
Steam is produced, and water is supplied as determined by the water level sensor.
Serviceability is limited to testing component functions and available voltages or
amperages. If any component fails, the steam generator must be replaced as an assembly.
The thermistor is a NTC (Negative Temperature Coefficient) device; as temperature goes
up, resistance goes down. The ohm value at room temperature is approximately 60KΩ
and the voltage measured across the sensor is approximately 3.6 V
value is approximately 3.3 KΩ and the voltage measured across the sensor is 0.88 V
In the test mode, the heater will be ON for 1.5 seconds and the temperature for the
steam generator will be displayed in degrees Celsius. While in the test mode, with the
thermistor open or disconnected, the heater will not heat and the display will show 0. In
a steam cycle, the heater will be OFF if the sensor is open or disconnected.
WM3001H*A
The water level sensor is a simple device
that signals the main board to trigger the
solenoid to supply water to the steam
generator.
Page 95
WM3001H*A
At 212º the ohm
DC.
DC.
Washer