Most dishwashers are connected only to the cold water system, so the operation of the heating element is very important, otherwise the dishes will not be washed. If the dishwasher does not heat the water, it will be noticeable immediately after the completion of the washing cycle. This means that there is an urgent need to fix the problem. It is not necessary that in this case we are talking about the failure of the thermal sensor, there are other reasons.
The main reasons why the water in the dishwasher remains cold:
- the heating element itself is faulty;
- the thermostat is faulty;
- faulty control unit element.
In addition to the main reasons why the water in the dishwasher does not heat up, there are additional ones. At first glance, it seems that these failures cannot have any effect on thermo elements, but this is actually not the case. Let’s look at auxiliary reasons why the water in the tank of the dishwasher does not heat up.
- Dishwasher plugged in with broken instructions.
- User error when selecting the wash mode.
- Faulty pressure sensor.
A pressure sensor helps control the circulation of water in the dishwasher. If the pressure sensor is faulty, water can constantly circulate in the dishwasher, which in turn can lead to self-draining. Under these conditions, even if the heater is in working condition, it simply does not have time to heat the water and the dishwasher to implement the washing program forced to use cold water. The problem is solved by replacing the pressure sensor, the repair is useless in this case.
If the dishwasher stops heating, perhaps the reason lies in the blockage of the dust filter. Some people will ask, but what does the garbage filter have to do with it and what does it have to do with the heating element?
The fact is that during the implementation of the washing program, water should circulate normally between the tank and special tanks, respectively, the heater keeps the water temperature, ensuring the normal quality of washing dishes. Also, if the filter is clogged, the circulation is disturbed. This leads to the accumulation of water in the tank, the system will be forced to replenish the water (which does not come back from the tank with the dishes to the tank) from the water supply system, and it accordingly, is cold — the heating agent simply does not have time to heat it.
To identify this problem, you need to look into the tank during the wash. Under normal conditions, the water should not linger there. If water accumulates in the tank, then you need to immediately clean the trash filter. After this, the circulation of water will resume, and it will be possible to count on the elimination of problems with water heating, if, of course, there was no simultaneous breakdown of the thermistor or heating element, and this is also quite possible.
Sometimes a Bosch dishwasher (or other brand) does not heat the water for a very prosaic reason — the user chooses the wrong washing program. This rarely happens, because in modern “dishwashers” there are not so many programs to get confused in them, but it still happens. Solution — read the instructions and learn how to select the desired washing program for a specific volume and category of loaded dishes.