Electrolux WE170P, Service Manual, Page: 42 / 85

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10.13 Water level sensor
10.13.1 General characteristics
The electronic water level sensor is an analogue device that controls the water level in the drum, and it is
directly connected to the main PCB.
1. Small pipe
2. Core
3. Oscillating coil
The water level sensor is connected via a pipe to the pressure chamber.
When water is introduced into the drum, this creates a pressure inside the hydraulic circuit that causes the
membrane to change position. This in turn modifies the position of the core inside the coil, thus changing
the inductance and the frequency of the oscillating circuit.
The PCB recognises how much water has been introduced into the drum according to the frequency.
1. Main circuit board
2. Analogue water level sensor
Operating frequency variation according to the quantity of water in the tub.
In the event of a fault an alarm will be displayed - see table of alarms.