When they first hear the word “interference suppression,” most consumers do not attach any importance to the fact that it refers to a unit for washing clothes. Simply put, this is a network filter, also known as a “capacitor,” a semiconductor mounted on the power wire of the machine. Today we will figure out why an interference filter is needed for a washing machine, and we will clarify the sequence of work to check its serviceability and replace it.
The principle of operation of the interference filter
In standard situations, the device is capable of transmitting vibrations with a frequency of 50 Hz. All deviations from this indicator in any direction lead to the part blocking the operation of the washing machine. It should be noted that the washing machine’s protective device does not always withstand excessively sudden voltage drops in the electrical network. In such cases, it loses its ability to work and needs to be completely replaced. To create maximum protection for household appliances, a stabilizer device is used in combination with a network interference filter.
Types of capacitor devices
There are two types - internal and external. The first option is installed immediately during the manufacturing process of the washing machine. The external interference element is presented in the form of an extension cord with the ability to connect from three to eight household electrical appliances.It has a special button that turns off the flow of current to the devices if there is a voltage drop in the network.
Need for use
The constant use of a relay switch, starting and stopping the rotation of the machine motor creates changes in the electric current, which should not be allowed into the network so that other connected equipment does not fail. The filter element will “catch” any drop and redirect the excess current to the ground line.
A sharp drop in voltage can cause the motor to burn out. It stops rotating, but current continues to flow to the winding. The washing machine's surge filter, which is a kind of interference, will immediately turn off the unit. If the voltage surges are short-lived, the anti-interference protection will use the charges of its own capacitor elements so that the washing machine continues to function normally.
If the surge protector fails, it must be replaced completely, because each internal part is coated with a special moisture-proof mixture that does not conduct electric current.
You can remove and change the device yourself, but you must first make sure that it is out of order.
How to check the interference filter on a washing machine
Many washing units are designed in such a way that if the power filter fails, they automatically stop their operation and will not start until the failed element is replaced.The conclusion that follows is that the washing machine does not turn on, and the plug and cord are in good condition; it is necessary to check the device for interference. In cases where washing machine shocks, there is a burning smell, the unit independently changes operating modes - the network interference filter is checked.
The algorithm of actions is as follows:
- We check all contacts in pairs with a multimeter, the resistance of which should be 680 kOhm;
- The input resistance of the plug is measured. The value should be as in the first case. Some upward deviation is allowed;
- It is difficult to check the serviceability of capacitors, but it is possible to measure the capacitance between different inputs. The indicator is within 0.47 µF.
DIY repair
Having determined the malfunction, you should remove it from the washing machine body and replace it. To do this, certain actions are performed:
- the washing machine is disconnected from the electrical network;
- the top panel is dismantled;
- We inspect the inside of the case in the place where the cable powering the machine comes out, to find the part we need.
You can find a working similar part in any store that sells washing machines. Just don't forget that for washing mashine models LG, Bosch, Atlant or Indesit network filters may differ in design. If you cannot find the original part, you can use a spare part that is similar in electrical parameters.Just pay special attention to the permissible pulse overload and the maximum value of current consumption, which should be two to three times higher than that of your washing machine.
Conclusion
We found out what is considered one of the reasons for the breakdown washing machine. When the noise filter fails, there is no need to panic. You need to know that such filters lose their functionality quite rarely, for a serious reason related to network congestion. To fix the problem, you can call an experienced specialist from the service center or do the necessary work yourself.
