Water Level (Pressure) Switch - LG WM3001HRA Training Manual

TRAINING MANUAL WM3001H*A
DISASSEMBLY and REPAIR, continued
WATER LEVEL SWITCH
The water level detector switch monitors the water level and feeds this information to
the main board. The sensor reads air pressure in an air chamber on the tub. The air
pressure changes in relation to the depth of the water, moving a diaphragm in the switch.
As the water level fluctuates, it raises or lowers the iron center in the coil, which, in turn,
changes the electric resonance of the oscillator circuit of which it is a part. As water level
decreases, frequency increases.
(e.g. A low water level may read 25.5 kHz, while a high water level may read 21.4 kHz.
These readings are approximate; washers in the field may vary slightly from these
figures.)
To read the frequency while the WM3001H*A is running, simultaneously press and hold
the SOIL LEVEL and WASH / RINSE buttons. The number on the display should be
divided by 10 to obtain the frequency reading in kHz. A display of 254 would indicate a
frequency of 25.4 kHz. The MICOM interprets the frequency reading as one of eight
levels, with one being the lowest water level and any level greater than eight indicating an
overflow situation.
WM3001H*A Page 48 Washer