If there is a problem with the washing machine, too much water is poured into the tank - the cause is a breakdown in 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 accumulated volume.
Is repair necessary in this case? 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 of the machine. Getting to it is simple, just remove the top panel: the device is at the very top.
A tube emanating from the pressure take-off chamber is attached to the pressure switch, and wires are additionally connected to it. The sensor contains a membrane inside, which bends when pressure occurs. As a result of this, the contacts are closed, sending a signal to the main module.
The module then sends a signal to the inlet valves about the completion of the water intake. They close, the washing process begins. Look at the operation and connection diagram of the pressure switch:
Symptoms
How to determine if level sensor replacement is required? You can do this by the following signs:
- The washing machine displayed an error code on the display, indicating a breakdown.
- You notice that the water is typing 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 to work with an empty tank. A faulty relay sends a signal to the module about the intake of water, but in fact it is not in the tank.
- Water is not completely drained. After spinning, you take out poorly wrung things.
How to check and replace the level sensor
So, you noticed such malfunctions and suspected that the relay is malfunctioning. How to check it at home:
- Disconnect the washing machine, shut off the water supply.
- Next, you need to remove the top cover, behind which there is a level sensor.
- Use a Phillips (hex) screwdriver and unscrew the two screws from the back.
- Sliding the cover slightly forward, lift it and put it to the side.
- Take a photo of the pin arrangement of the pressostat.
- Disconnect the wires from it, lift the handset.
- Unscrew the self-tapping screws fixing the sensor.
After you have pulled the pressure switch out of the SMA housing, proceed with its inspection. If no outward signs of damage are found, do this:
- Take a small hose the size of the connector into which the sensor tube is inserted.
- Install it in place of the tube hole.
- Blow into the tube.
- 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 is required.
If you blew into the handset and heard clicks, check the pressure switch hose for clogging. Rinse it under the pressure of tap water.
Before replacing the pressure switch on the washing machine, conduct an additional check.
- Take a multimeter. Set the tester to measurement mode - ohmmeter.
- Connect the test leads to the sensor contacts.
- Blow into the tube and follow the tester.
- The multimeter will record the closing and opening of the contacts. This will indicate the serviceability 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 name the make and model of your CM seller, he will give you the part you need.
To replace the pressure switch in the washing machine, take a new appliance, connect the pressure hose to it. Then connect the wire connectors to the contacts. Fix the sensor with self-tapping screws in the same place.
Fine! Work is done. For self-repair, we suggest watching a video about replacing a relay: