LG WM2496H M Series Manual page 117

Disassembly
Water Level Switch
The water level detector switch monitors the water level and feeds this
information to the MICOM. 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.)
WM2496H*M
p45