Problems with the temperature of the water in the washing machine: check sensor

A washing machine is a sophisticated household appliance that can support several washing modes for different types of laundry at once. One of its main features is the rapid heating of water for washing with the help of PETN.Temperature control is carried out through built-in sensors. If the water is too cold or hot, then you need to check the temperature sensor in the washing machine and it is possible to replace it with a new one.

The main temperature sensors in the washing machine

The automatic machine can be equipped with various types of sensors that monitor. Usually there are several varieties:

• thermistors;
• bimetallic;
• gas-filled.

As you might guess, they differ in design features and operating principles. Diagnostics of malfunctions and further repairs may depend on this. But first you need to determine the presence of damage.

This is usually quite difficult to do, because the water is inside and it is not clear what the temperature is there. One of the signs is the presence of a large amount of steam. This means that the inside of the contents almost boil. You can also identify the opposite effect - if the water drains cold, then the machine does not heat anything.

How to check the temperature sensor in a washing machine?

Usually with simple washing modes, heating to 30 ° C is required. In some cases of malfunctioning, the sensor does not send a signal to stop the heating element operation, so the machine continues to heat the water to the maximum possible temperature. In such cases, repairs are needed, because this can ruin the laundry or lead to high energy costs.

A malfunction may lie not only in the temperature sensor, but also in a special programmer responsible for automatic control. Features of the check depend on the specific species.

Malfunctioning bimetallic sensors are usually associated with mechanical damage or wear, with the result that the circuit does not open. As a result, the water is brought to the critical boiling point. To check the status, do the following:

• partially disassemble the washing machine body;
• remove the terminals of the wires from the temperature sensor;
• use a multimeter on the pins when choosing different modes.

Resistance should be the same, but in case of faults, it will be different under different conditions.

Gas-filled thermostat is larger than bimetallic and includes a copper capillary tube. Usually the fault is related to damage to this freon tube. If the gas volatilizes, then the temperature is determined incorrectly. The following procedures are carried out for testing:

• partially disassemble the body of the machine to get to the sensor;
• use a multimeter to measure resistance between terminals;
• to listen to whether there is a characteristic click when opening contacts when stopping heating of heating elements.

Thermal sensors washing machines are usually located at the bottom of the tank. Care must be taken not to damage the copper tube during repairs.

Modern models of washing machines are equipped with electronic thermistors. They measure resistance with semiconductors. Resistance depends on the specific temperature of the water inside the tank. In addition to this, there is a special controller responsible for the operation of the heating element. Such varieties are considered the most effective, but the repair in this case is more difficult. Usually only replacement of the thermal sensor can save.

These sensors are plastic or metal rods that are attached directly to the unit of the heating element. Their working part is immersed in water to determine the temperature.

What is the resistance of the washing machine temperature sensor?

Depending on the specific model of the machine and the type of sensor used, the resistance will be different. For models Zanussi, Electrolux, AEG at a temperature of 30 ° C, the indicators will be 17-17.5 kΩ, and at 80 ° C - about 2.1-2.5 kΩ.Usually, the higher the temperature, the less resistance.

For Candy models in normal modes, the indicators are 27.0 kΩ.Ardo machines have about 5.8 kΩ.At Ariston - 20.0 kOhm. The resistance of Samsung sensors at room temperature is 12 kΩ.

However, such information is not 100% genuine, and therefore cannot serve as a basis for immediate repair. It is necessary to accurately establish the characteristics for a specific model and only after that to carry out a replacement or to try to troubleshoot. Details can be found in the descriptions of the machine or on the website of the manufacturer of household appliances.

If you take up the repair of a washing machine, you will need to carefully check everything and prepare the tools. However, it is always better to consult with experts about a particular model.