Checking the pressure switch of the Indesit washing machine

If the level sensor fails, the Indesit automatic machine may simply freeze during the washing process and refuse further operation. In order to independently cope with the problem that has arisen, you need to understand how the element is structured and what meaning it has. So, let’s figure out how to check the pressure switch in a washing machine with your own hands, adjust and repair it.

Why is it needed and how is it designed?

The level relay is one of the main parts of the washing machine, without which the device simply could not function. The operation of the machine is regulated by the control module, to which the pressure switch sends signals that there is enough water in the tank, you can stop taking it and close the inlet valve. It is thanks to the level sensor that the main unit knows that the tank is filled with a sufficient amount of liquid. Let's talk in more detail about the operating principle of the pressure switch.

The liquid level switch controls the volume of water poured into the tank. Any of the washing programs involves the addition of different amounts of liquid. The pressure switch is a round-shaped part that has a plastic body. The pressure hose and electrical wiring are connected to the sensor. Inside the element there is a switch and a thin membrane.

Air passing under high pressure through the hose is transmitted to the membrane surface, which changes shape and closes the switch. Next, through the connected wires, a signal about the need to stop water intake is transmitted to the control module. This is how the liquid level sensor in the tank works.

It is worth mentioning where the pressure switch is located in the Indesit machine.It is located under the top cover, near the side wall of the unit.

Symptoms of a broken level sensor

How can the user guess that the reason for the malfunction of the washing machine lies precisely in the breakdown of the liquid level relay? Most automatic machines in the Indesit line are equipped with a self-diagnosis system for emerging problems. Having detected a breakdown of the pressure switch, the washing machine will immediately transmit information about the error code to the display. Using the manual for using the SMA, deciphering the code will not be difficult.

If the machine does not display a fault code, a signal about a problem with the pressure switch will be the lack of water in the drum after starting the wash. In this case, you can observe that the washing machine still turns on the heating element. Another sign of a level sensor failure is uncontrolled, continuous intake of water into the tank. And finally, poorly wrung laundry indicates that the relay has failed; the water cannot completely escape through the drain hose and the clothes remain wet.

However, these signs may also indicate a breakdown of other elements of the MCA, for example, the main control module or inlet valve. Maybe the machine is simply incorrectly connected to the utilities. To be sure that the problem is really with the pressure switch, it is important to understand how to check the level sensor in the device.

Finding and checking the level sensor

To check the pressure switch you do not need to have special knowledge. Even a beginner can cope with this task. The sequence of actions will be as follows:

• turn off the power to the washing machine;
• close the valve responsible for supplying water to the tank;
• remove the top cover of the case by unscrewing the screws holding it;
• find the liquid level switch;
• prepare a tube of a size similar to the diameter of the fitting;
• Disconnect the pressure hose, insert the prepared tube into it and lightly blow into it.

If the pressure switch is working properly, you should hear one or three soft clicks.

Then examine the part for damage. Inspect the hose for blockages and, if necessary, clean it with a stream of water from the tap.

When, after an external examination, no defects were identified, you will have to use a multimeter to further diagnose the sensor. Switch the device to resistance mode, connect the tester probes to the contacts of the pressure switch. If the value on the multimeter screen changes after the procedure, it means that the contacts are working perfectly; if the resistance value remains the same, the relay must be replaced.

Adjusting the part

In some cases, replacing the pressure switch can be avoided if it is adjusted and configured correctly. To make adjustments, you must have information about the volume of water that the Indesit machine requires to complete the washing program. Depending on their number, there are from 1 to 3 screws on the relay.

In accordance with the amount of liquid required for each mode, these screws are tightened. If you configure the level sensor correctly, you don’t have to spend money on buying a new element.

Finding the exact setting coordinates is not easy, so this type of work is usually carried out by professionals.

Changing the level sensor

You can replace a non-functioning pressure switch with a new one on your own, without resorting to the help of specialists. The first task will be to purchase a part similar to the failed relay. For the seller to select the appropriate element, you just need to name the exact model of your washing machine, but you can take a non-working level sensor with you to the store.

After the pressure switch has been purchased, you can begin replacing it. It is necessary to remove the level sensor that has lost its functionality.

1. Disconnect all hoses and contacts leading to the part (be sure to take a photo of the wire connection diagram).
2. Unscrew the screws securing the pressure switch to the SMA housing.
3. Remove the device.

As you can see, the work is not difficult. To install a new liquid level switch, perform all the steps described again, but in reverse order. Using the mounting bolts, install the new sensor, attach the pressure hose, and secure the clamp. Then you need to connect all the contacts and wires. Afterwards, install the cover of the machine body in place. Having completed all the basic steps for replacing the pressure switch, you can start the Indesit washing machine and check its performance.

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