Ariston dishwasher does not heat water

There are many signs that your dishwasher needs repair. One such symptom is dishes that remain stained with dirt, grease, and food residue after a cycle. It's also worth paying attention to situations where the dishes remain wet after use, as if they weren't dried at all. Both of these situations indicate that your Ariston dishwasher likely isn't heating the water. We'll explain why this happens and how to fix it in today's article.

We determine the range of possible problems

The problems listed above can happen to anyone the first time you use your dishwasher, but this doesn't mean the appliance is broken or was sold to you defective. It's quite possible the appliance was simply connected incorrectly.

To properly connect household appliances, it's necessary to make two gentle bends in the hose: the first at the entrance to the dishwasher, and the second where the hose meets the siphon. Failure to make these bends will result in water from the drain constantly backing into the Ariston dishwasher. This will prevent the dishwasher from draining properly, preventing proper water circulation. Consequently, the water temperature set by the user will not be reached.

But what if all the procedures were performed correctly, the appliance is connected correctly, but the water isn't heating? In this case, it's time to check the most common causes of water temperature issues. Fixing them requires minimal knowledge of the appliance, as everything can be done precisely by following our instructions. First, we'll diagnose the dishwasher's heating element, thermostat, and control module.

Let's pay attention to the heating element

If your machine isn't heating water, even if you have an expensive model with a smart self-diagnostic system, it may not identify the cause of the problem. If you can't find the error code because the diagnostics aren't working, you'll have to examine the machine yourself.

1. Turn the device over.
2. Remove the back panel 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 precisely in it. In hard water conditions, a heater can fail once a year or even more frequently, so don't even try to repair this consumable; instead, buy a new one immediately.

Temperature sensor and control module

The thermostat, like the heating element, often fails in modern dishwashers, so the temperature sensor is the next component to check. If you suspect this component, follow these steps:

• we disconnect the equipment from all communications;
• we take out all the baskets from the washing chamber;
• disconnect the lower sprinkler;
• remove the debris filter from the bottom of the chamber;
• turn the machine upside down;
• we disconnect all side fasteners;
• we 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 sensor connection so that you have an example of how to connect the wires at hand later.

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

If the element is damaged, purchase a new one and install it according to the instructions in reverse order. After replacement, check the dishwasher's functionality, and if the problem persists, check the control board. This is the "computer" or "brain" of the dishwasher, which controls all other components. Therefore, if all other components are working properly and continue to reliably send signals to the control board, but the control board itself is damaged, the machine simply won't function properly. There will be no one to transmit the command to heat the water.

The control board is one of the most expensive components in a dishwasher, so you shouldn't attempt to repair it yourself, as you might accidentally damage it further. If all other components have been checked and the only remaining issues are the control board, it's best to immediately call a service center specialist who can perform a thorough diagnosis and perform complex repairs.

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

There is too much junk inside

The dishwasher's dirt filter prevents food debris and other debris from penetrating and clogging the machine's main components. This component in Ariston dishwashers performs its primary function perfectly, so it often becomes clogged due to the large amount of dirt it traps. If this dirt isn't removed promptly, it will eventually interfere with the appliance's proper water circulation, causing the heating element to shut off and the water inside the dishwasher to simply not heat up. To fix this, simply thoroughly clean the filter of any food debris or other dirt.

Why does a clogged filter have such a serious impact on heating? When the appliance is activated, water should circulate freely between the storage tank and the special containers. The heating element constantly maintains a certain water temperature, which is sufficient for a perfect dishwashing. If water circulation is poor, water accumulates in the tank, and the dishwasher must replenish its reserves by adding cold tap water, which the heating element can't heat up quickly.

Always pre-rinse dishes and remove any food debris to reduce the likelihood of the filter clogging.

Depending on how often you wash, clean the debris filter at least a few times a month to avoid problems with water heating. The storage tank, which can be checked while the machine is running, may tell you that it is time to clean the filter.If it fills with water, it's time to clean the filter. A thorough cleaning of this element will restore stable water circulation and resolve the heating issue.

Is the program set up correctly?

Another common reason for water not heating is an incorrectly selected operating mode. If the control is set to 40 degrees Celsius while the toggle switch is set to 90 degrees Celsius, the dishwasher will not heat the water any hotter than 40 degrees Celsius.

It's also worth considering that your dishwasher may simply be set to a delicate cycle. This cycle means the dishwasher will only heat the water to 40 degrees Celsius. Check the cycle setting to be sure it's not the problem.

Is the required pressure being created?

Finally, the final check is the pressure sensor, which monitors water circulation within the machine. If this component is faulty, water circulation will continue uninterrupted, causing the machine to automatically drain.

Under these conditions, the heating element won't be able to consistently heat the water to the required temperature, so the appliance will operate in cold water. If this happens, you can try cleaning the pressure sensor contacts and checking the wiring. If this doesn't help, the only option is to buy a new element.

   

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