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If there is a malfunction in the operation of the washing machine, too much water is poured into the tank – the cause is a breakdown of the pressure switch. This device monitors the water level in the tank, and if it malfunctions, the control module does not receive a signal about the collected volume.
Does this need a repair? You will need to replace the level sensor, which you can do yourself.
Appearance and principle of operation of the sensor
The pressure switch is a small round element that is located at the side wall of the machine. It is easy to get to it, just remove the top panel: the device is located at the very top.
A tube emanating from the pressure sampling chamber is attached to the pressure switch, additional wires are connected to it. The sensor contains a membrane inside that flexes when pressure is applied. As a result, the contacts close, sending a signal to the main module.
Next, the module sends a signal to the inlet valves about the completion of water intake. They close, the washing process begins. Look at the scheme of operation and connection of the pressure switch:
Symptoms of a malfunction
How to determine that the level sensor needs to be replaced? You can do this in the following ways:
- The washing machine showed an error code on the display, indicating a breakdown.
- You notice that the water is drawn incorrectly. Its volume does not reach the minimum level in the tank or exceeds the maximum mark.
- Water is constantly being collected.
- Rinse mode does not start.
- The heater starts working when the tank is empty. A faulty relay sends a signal to the module about the intake of water, but in fact there is no water in the tank.
- Water does not drain completely. After spinning, you take out poorly wrung out things.
How to check and replace the level sensor
So, you noticed similar malfunctions and suspected that the relay was faulty. How to check it at home:
- Turn off the washer, turn off the water supply.
- Next, you need to remove the top cover, behind which is the level sensor.
- Use a Phillips (hex) screwdriver and remove the two screws on the back.
- Slide the cover forward slightly, lift it up and put it aside.
- Take a picture of the location of the pressure switch contacts.
- Disconnect the wires from it, remove the tube.
- Unscrew the screws securing the sensor.
After you have pulled the pressure switch out of the SMA housing, proceed to inspect it. If there are no outward signs of damage, do this:
- Take a small hose, about the size of the connector into which the sensor tube is inserted.
- Install it in place of the tube hole.
- Blow into the phone.
- If you hear clicks (there may be from two to three, depending on the type of sensor), then the device is working.
- If there are no clicks, a replacement will be needed.
If you blow into the tube and hear clicks, check the pressure switch hose for blockage. Rinse it under running tap water.
Before replacing the pressure switch on the washing machine, perform an additional check.
- Take a multimeter. Set the tester to measurement mode – ohmmeter.
- Connect the probes to the sensor contacts.
- Blow into the tube and follow the tester readings.
- The multimeter will record the closing and opening of the contacts. This will indicate the health of the device.
If you are convinced that the pressure switch is broken, you need to pick up a new relay for the washing machine. You can go to the store with an old sensor, or just give the make and model of your CM to the seller, he will give you the part you need.
To replace the pressure switch in the washing machine, take a new device, connect a pressure hose to it. Then connect the wire connectors to the contacts. Fix the sensor with self-tapping screws in the same place.
Great! Work is done. For self-repair, we suggest watching a video about replacing the relay: