Tub Water Level Control Analogue Pressure Switch; General Characteristics - Electrolux EWM09311 Service Manual

21.10 Tub water level control analogue pressure switch

21.10.1 General characteristics

The electronic pressure switch is an analogue device that controls the water level in the tub, used in models
with the electronic control system, and is connected directly to the main PCB.
1 Pipe
3 Oscillating coil
5 Core
The pressure switch is connected via a pipe to the pressure chamber.
When water is introduced into the tub, 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 tub according to the frequency.
1. Main circuit board
3. Analogue pressure switch
Operating frequency variation according to the quantity of water in the tub
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Technical Support - DMM 599 75 58-67 Rev. 04