Operating Principle - Electrolux EWX11831 Service Manual

This component introduces water into the detergent dispenser and is controlled electrically by the main circuit
board via TRIAC. The level of water in the tub is controlled by the analogue pressure switch.
1. Water inlet
2. Solenoid valve body
3. Filter or needle trap
4. Flow reducer
5. Coil
6. Spring
7. Moving core
8. Rubber
9. Membrane
10. Water outlet

13.13.1.1 Operating principle

When idle, the core, pushed by a spring, keeps the central hole of the membrane closed and so the latter
hermetically seals access to the water inlet duct.
When the coil is powered, the core is attracted, releasing the central hole of the membrane. Consequently
the valve opens.
13.13.1.2 Mechanical jamming of the solenoid valve
The solenoid valve may jam open without being actuated (which will
cause flooding if the pressure switch controlling the water level
does not trip). If this occurs, the electronic control system (which
continuously monitors the flow sensor) will lock the door, start the
drain pump and display an ALARM simultaneously.
13.13.1.3 Low water pressure
If the flow sensor does not generate a signal during the water fill phases, even though power is being supplied
to the solenoid valve, the cause of this condition may be a closed water tap or clogged filter on the solenoid
valve (with ensuing low water pressure). If this occurs, only a WARNING will be displayed and the cycle will
continue for five minutes, after which time an ALARM will be signalled.
1. Main electronic circuit board
2. Door safety interlock (with Door sensing switch)
2a Door safety interlock (without Door sensing switch)
7. Pre-wash solenoid valve
8. Wash solenoid valve
9. Bleach solenoid valve
10. Hot water solenoid valve
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Technical Support - DMM 599 77 23-65 Rev. 03