The water level in the dishwasher (ancient Indesit 310) does not activate the pressure switch. Pressure switch is ok and no leaks on any hoses. The water level in the hose leading on to the pressure switch remains constant, although the level in the dishwasher keeps on rising (this hose is still intact). Any solutions?
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Re: Water filling does not stop
Water supply to the dishwasher is done through an electromagnet valve,loocated at the water pipe's enterance to the machine. A defect in the valve may mean that it's no longer able to shut off completely when the electricity has been turned off to it, and the valve may leak and drip water into the tub.You can easyly open the valve and clean it (from scale or other dirt). Be aware you should disconnect the power cable from the machine before doing it !!!!! and as well to close water main tap to the machine.
In case cleaning doesn't help, you should replace the valve.
Good luck !!
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25 years ago technicians repaired the pressure switch if it was possible.
Today, their price is such that it is not worth and it is very small chance that you will succeed. My advice is to buy a new pressure switch and replace it.
the water level sensor is disconnected but probably bad and needs to be replaced. This is possible to be done by you but I like when they do it, any thing happens you have there insurance to make repairs and be responsible for property damage.
This control procedure is in operation only during the cold wash and heating phases.
Once the pressure switch has closed in the "full" position, it must remain "full" until the subsequent drain phase; if the pressure switch signals "empty", the fill solenoid is activated for a period equivalent to the period of aperture of the pressure switch.
The maximum aperture time for the pressure switch (T) during the entire phase is 60 seconds; if this period is exceeded, an alarm condition is generated.
Is the machine siphoning off water as it fills? If it is check the height of the drain hose and make sure it is above the height of the normal level of water that would be in te drum when washing, if the hose is to low the drum will siphon off the water on its own and continue to fill. If the machine is not siphoning off water while filling then you may have a blocked pressure hose or the pressure hose bottle may be blocked not allowing the pressure switch to activate. there may even be a small hole in the pressure switch hose. Check the thin pressure hose that goes from the bottom of the drum to the pressure switch.
The water level in your, and most other, washing and dishwashing machines is controlled by an air pressure switch that senses water level by the rising air pressure compressed in the pressure, (level), switch body itself. This air pressure is usually transmitted by a thin rubber tube on the bottom of the washing machine drum, or sump hose. As the water gets higher in the drum, air is compressed in the level switch until it operates, and turns the fill valves off. The pressure switch is always mounted at the top of the washing machine cabinet - look for a circular switch with the thin rubber or plastic tube fitted into the bottom. What can happen is if the rubber tube rubs against moving parts in the washer, it can get a hole worn in it - so the air does not compress and the water doesn't turn off.. You will have to examine the tube very carefully to find holes like this. Alternatively, the tube could have come off, or blocked with limescale at the bottom end - try removing the tube at the pressure switch end and blowing through it - any blockage must be removed. A last, rare, possibility is the rubber diaphragm in the pressure switch is leaking - but very very rare. Most modern machines have an electronic backup that measures fill time in case the pressure switch fails. If your machine floods, it doesn't have this.
The water level detector pipe could be obstructed / blocked. This thin plastic pipe is at the bottom of the washer and as it fills to the correct level of water the pressure in the pipe activates a water level switch in the washer. Sometimes the air pressure pipe becomes blocked / obstructed or the contacts of the pressure switch become burnt. You can disconnect the pipe and blow through it and the pressure switch is normally factory set and does not need adjusting. Replace it if necessary.
Washers have a water level sensor that consists of a plastic pipe that feeds a pressure switch that activates once the correct amount of water causes the air pressure in the pipe to activate the water level switch. The switch is normally adjustable but should be factory set only once. The plastic pipe does sometimes become clogged and could be cleaned.
I have found that in some instances the electrical contacts in the pressure switch burn and the pressure switch must be replaced.
There are two ways that dishwashers generally fill. One is a float inside the tub, the second is a tube which fills with water, loops and goes to a pressure switch below the machine. That switch is usually about 1.5 inches in diameter, two wires and a small hose going to it. The float witch is found below the float in the motor area. With the float, sometimes they jam with too much old detergent or food goo. Clean out. Both can have the switch weld closed. Change the switch in either case. Since the unit is not filling with the power off, I'm going to guess the water solenoid is okay.
If it does not fill properly to a certain level, the heater will NOT come on, so you need to solve the filling problem.
Is the drain hose raised sufficiently?
Is the pressure hose blocked?
Does it let water in and then just stop?