Ariston dishwasher does not heat water

There are many symptoms that indicate your dishwasher needs repair. One of these is dishes that, after a working cycle, remain with dirt, grease and food residues. You should also pay attention to situations when, after work, tableware remains wet, as if it had not been dried at all. Both of these situations indicate that, most likely, the Ariston dishwasher is not heating the water. Why this happened and how to deal with it – we’ll tell you in today’s material.

We determine the range of possible problems

The problems listed above can happen to anyone the first time they start a dishwasher, but this does not mean that the equipment has already broken down or was sold to you with a defect. It is possible that the device was simply connected incorrectly.

As part of the correct connection of household appliances, it is necessary to make two smooth bends in the hose: the first at the entrance to the dishwasher, and the second at the junction of the hose with the siphon. If these bends are not made, then water from the sewer may constantly flow back into the Ariston dishwasher. Because of this error, the “home assistant” will not be able to drain the water, so there will be no normal circulation of liquid in the device. Consequently, the water temperature level that was set by the user before starting work will not be reached.

But what to do if all the procedures were carried out according to the rules, the equipment is connected correctly, but there is no water heating? In this case, you should check the most popular reasons for the problem with the fluid temperature.To eliminate them, you will need minimal knowledge of how equipment works, because everything can be done clearly according to our instructions. First of all, we will diagnose the heating element, thermostat and PMM control module.

Let's pay attention to the heating element

If the machine does not heat the water, then even if you have an expensive model with a smart self-diagnosis system installed, it may not determine the cause of this problem. If you cannot find out the error code because the diagnostics do not work, you will have to study the device yourself.

1. Turn the device over.
2. Remove the back wall to gain access to the heating element.
3. Inspect the heating element for damage.
4. Additionally, test the part with a multimeter set to ohmmeter mode.

If cracks, chips and a large layer of scale are found on the element, then the problem with heating the water was in it. In conditions of hard tap water, the heater can fail once a year or even more often, so you should not even try to restore this consumable, but should immediately buy a new one.

Thermal sensor and control module

The thermostat, like the heating element, quite often fails in modern dishwashers, so we will check the temperature sensor next. If suspicions fall on this element, then perform the following actions:

• disconnect the equipment from all communications;
• We take out all the baskets from the washing chamber;
• disconnect the lower sprinkler;
• remove the garbage filter from the bottom of the chamber;
• turn the machine upside down;
• disconnect all side fastenings;
• disconnect the drain pipe, then remove the bottom of the unit, freeing access to the temperature sensor;
• disconnect all wires connected to the thermostat;

Be sure to take a photo of the correct connection of the sensor so that you later have an example of how to connect the wires.

• clean the contacts of the part;
• We test the thermostat with a multimeter.

If the element is damaged, you should purchase a new one and install it in place according to the instructions in the reverse order. After replacement, you need to check the functionality of the PMM, and if the problem remains, then pay attention to the control board. This is a kind of “computer” or “brain” of the dishwasher, which commands all other components of the device. Therefore, if all other elements are in good working order and continue to stably send signals to the control unit, but the unit itself is damaged, then the machine simply will not be able to function correctly. There will be no one to give the command to heat the water.

The control module is one of the most expensive parts in a dishwasher, so you should not try to fix it yourself, so as not to accidentally damage it even more. If all other elements have already been checked, and questions remain only about the control board, then it is better to immediately call a service center specialist who can carry out accurate diagnostics and perform complex repairs.

But the heating element, control unit and thermostat are not the only things that can affect water heating. Additional reasons include clogged filter, incorrect choice of operating mode, and problems with the pressure sensor.

There's too much trash inside

The garbage filter in the PMM prevents food debris and other debris from penetrating into the main components of the machine and clogging them. This part in Ariston dishwashers does an excellent job of its main function, so it often gets clogged due to the fact that it blocks a large amount of dirt.In turn, if this dirt is not removed in time, then at one point it will begin to interfere with the stable circulation of water in household appliances, which is why the heating element turns off, and the water inside the “home assistant” simply does not heat up. To fix this, you just need to thoroughly clean the filter from food debris and other contaminants.

Why does a clogged filter affect heating so seriously? When the device is activated, water should circulate without difficulty between the storage tank and special containers. At this time, the heating element constantly maintains a certain water temperature, which is enough to perfectly wash the dishes. If the water circulation is weak, then the water has time to accumulate in the tank, and the PMM has to restore reserves by adding cold tap water, which the heater does not have time to heat.

Always pre-rinse your dishes and remove any leftover food so that the filter becomes much less likely to clog.

Depending on the frequency of washing, clean the debris filter at least several times a month to avoid problems with water heating. The storage tank can tell you that it’s time to clean the filter, which can be checked while the machine is running.. If it gets too full of water, then it's time to clean the filter. Thorough cleaning of this element will restore stable water circulation and correct the problem with heating the liquid.

Is the program set correctly?

Another common reason for the lack of water heating is considered to be an incorrectly selected operating mode. If the regulator is set at 40 degrees, while the toggle switch is fixed at 90, then the PMM will not heat the water more than 40 degrees.

It is also worth considering that your machine may simply have a delicate dishwashing mode selected. Its peculiarity is that the PMM will also heat the water only up to 40 degrees. Check the installed mode to make sure it is not the problem.

Is the necessary pressure created?

Finally, the final check point is the pressure sensor, which monitors the water circulation in the device. If this part fails, then the circulation of water will be continuous, which is why the machine will start automatically draining the liquid.

In such conditions, the heating element will not have time to constantly heat the water to the required temperature, so the equipment will operate in cold water. If this happens, you can try cleaning the contacts of the pressure sensor, and also check the condition of the wiring. If this does not help, then all that remains is to buy a new element.

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