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In case of problems with the pressure switch (level switch), the machine may stop in the middle of the cycle, refusing further work. In this article we will consider the device device, its significance in the operation of a washing machine. You will learn how to check and adjust the pressure switch with your own hands.
The meaning and device of the pressure switch
Since the main module controls the operation of the parts in the machine, it needs to give a signal to stop the water intake, as well as close the inlet valve. But how does the module know that the dialed volume is sufficient? Let’s see what the purpose is, as well as how the pressure switch works in the washing machine. This element controls the amount of water drawn into the SMA. Each individual mode – washing or rinsing – requires a different amount of water.
Consider the principle of operation of the pressure switch in the washing machine. This is a rounded part that has a plastic case, connected to it: a hose through which pressure passes, and wiring. Inside the relay housing are a thin membrane and a switch. The pressure in the tank depends on the amount of water collected. Air under pressure passes through the hose, acts on the membrane, and it, arching, closes the switch. With the help of wiring, the module receives a signal to stop water intake. These are the device and operation of the pressure switch.
Many users do not know where the pressure switch is located in the washing machine. Some people think that it should be located inside the tank. In fact, the device is located at the top of the CM case, near the side wall.
Typical faults
How can the user guess about the breakdown of the level switch without disassembling the washer? Main features:
- SM with a self-diagnosis system, detecting a problem, immediately display the error code on the display. The user reads and decrypts the code, which makes it possible to understand which part is out of order.
- The washing process starts, but you see that there is no water in the drum. In this case, the machine turns on the heating element, which can lead to fire and malfunction of the heater.
- The amount of collected water exceeds the allowable level. Continuous supply of water is possible. There are situations when the level does not reach the minimum value.
- Poorly wrung linen. If the pressure switch malfunctions, it is possible that the water does not completely leave the tank, so the spin cycle is poor.
Such problems can also indicate a failure of other elements, such as a control module or an inlet valve. It is even possible that the system is not properly connected to the sewer. Therefore, to be sure, it is important to know how to check the relay (pressure switch) in the washing machine.
Step-by-step work before checking the pressure switch
Even a beginner can handle this job, so do the following:
- Stick to safety precautions. Disconnect your SMA from the mains by pulling the plug out of the socket.
- Tighten the inlet valve, which is responsible for the water supply.
- To check the water level sensor, you need to remove the top panel in the washing machine.
- After unscrewing the screws at the back, slide the cover forward. Be careful when doing this as the edges can be sharp.
- Putting the panel aside, find the device.
Prepare a tube with a diameter equal to the fitting of the pressure switch. Remove the pressure hose by loosening the clamp. Install the tube on the fitting and blow lightly. If the sensor is good, then the contacts will work and you will hear one or three clicks.
Check the device for damage. Check its hose for blockage. If it is clogged, clean the hole under the pressure of water from the tap.
When you are convinced that outwardly everything is in order, the last way to check is the multimeter. Set the tester to resistance mode and connect the tester probes to the relay contacts. When the contacts are actuated, the values must change. If they remain at the same level, then the sensor is faulty. To find out exactly which pins to connect the tester to, you will need an electrical circuit diagram of the device.
Self-adjustment of the pressure switch
Sometimes, instead of replacing a part, you can adjust or adjust the pressure switch in your washing machine. How to proceed:
- It is important to know how much water is required for each washing machine model for each program. Based on their number, there are from one to three screws on the sensor.
- In accordance with the required amount of water during the mode, you need to tighten the screws.
Knowing how to set up and adjust the pressure switch, you can not buy a new part. But it is quite difficult to calculate the correct setting coordinates, since such work is carried out by specialists at the factory. If you decide to replace the relay, read the next paragraph.
Pressure switch replacement
First, buy a new device. You can take your sensor and go to the store with it, but usually it is enough to tell the seller the model of the car to buy the right part. If you did not completely remove the relay when checking, do this:
- Disconnect all wires (take a photo or label the connections).
- Unscrew the bolts that secure the device to the case.
How to connect a pressure switch? Repeat all steps in reverse order:
- Screw it into place with the screws.
- Then connect the hose, securing the clamp.
- Connect wiring as marked.
Great! The work is done successfully – you can run your CM and check its work. Video on the topic will help you: