Coffee electrovalve also called solenoid coils and valves
Solenoid valve malfunctions are common in hard water areas and tend to fail when they become blocked by mineral build up inside the valve. Occasionally the coil may rupture on volumetric machines - when the button is pressed but no water, the whole valve should be replaced.
Parker Cime and Lucifer are the most common brands and are made in Italy. The best valves have a ruby red viton plunger inside the nucleus of valve - this last so much longer than the rubber grommet.
The main areas where you will have a electro valve is on the coffee group, electronic hot water and water inlet of a plumbed machine.
- Coffee group: When no water comes from the group, you may get steam but no water.
- Water inlet solenoid: Water is not getting to the boiler due to blockage, you will have coffee water but boiler is not filling - typically blocks when roadwork's occurs or town water refills in the summer letting rust or sediments into water supply and blocking both the valve and damaging the pump. Both pump and inlet valve will need to be replaced.
- Hot water solenoid: When you press button for hot water and you get just stem or no water - this gets blocked with lime over time and needs to be replaced.