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 importance in the operation of the washing machine. You will learn how to check and adjust the pressure switch yourself.
The meaning and arrangement of the pressure switch
Since the work of the parts in the machine is controlled by the main module, 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 accumulated volume is enough? 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 collected in the AGR. Each separate mode - washing or rinsing - requires a different amount of water.
Consider the principle of operation of the pressostat in the washing machine. This is a rounded part with a plastic casing, 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, curving, closes the switch. Using wiring, the module receives a signal to stop the water intake. These are the design 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 SM case, near the side wall.
Typical malfunctions
How without disassembling the washing machine, the user can guess about the breakdown of the level switch? Key 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 includes a heater, which can lead to fire and heater malfunction.
- The amount of water collected exceeds the permissible level. A continuous set of water is possible. There are situations when the level does not reach the minimum value.
- Badly wrung laundry. If there is a problem with the pressure switch, it is possible that the water does not completely leave the tank, so the extraction is of poor quality.
Similar problems can also indicate a breakdown in other components, such as a control module or inlet valve. Perhaps even the wrong connection to the sewer system. 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 will cope with such work, so do the following:
- Stick to safety precautions. Disconnect your SMA from the mains by unplugging the plug.
- Screw in 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 on the back, slide the cover forward. Be careful, as its edges may be sharp.
- With the panel aside, look for the appliance.
Prepare the tube with a diameter equal to the pressure switch fitting. Remove the pressure hose by loosening the clamp. Install the tube on the fitting and blow slightly. If the sensor is OK, 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 the tap water.
When you are convinced that everything seems to be 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 contacts are activated, the values must change. If they remained at the same level, then the sensor is faulty. To know exactly which contacts to connect the tester to, you will need an electrical circuit of the device.
Self-tuning pressostat
Sometimes, instead of replacing a part, you can make adjustments or adjust the pressure switch in your washing machine. How to proceed:
- It is important to know how much water is required for this model of washer to complete each program. Based on their number, one to three screws are on the sensor.
- In accordance with the required amount of water during operation, tighten the screws.
Knowing how to adjust and adjust the pressure switch, you can not buy a new part. But it’s quite difficult to calculate the correct settings coordinates, since such work is carried out by specialists at the factory. If you decide to replace the relay, read the next paragraph.
Pressostat replacement
To get started, buy a new device. You can take your sensor and go with it to the store, but usually to buy a suitable part, it is enough to name the model of the car to the seller. If you did not completely remove the relay during the test, do this:
- Disconnect all wires (photograph or mark connections).
- Remove the bolts that secure the device to the housing.
How to connect a pressure switch? Repeat all the steps in reverse order:
- Screw it into place using bolts.
- Then connect the hose, securing the clamp.
- Connect the wiring according to the marking.
Fine! The work was successful - you can run your SM and check its work. A video on the topic will help you: