Error F24 on a Miele dishwasher

The number of errors in modern smart dishwashers is impressive. The common error F24, which appears on the PMM display, informs the user that there is no water heating. Usually a faulty heating element is to blame for this, but the problem can also occur due to a lack of signal between the heating element and the control board, a burnt-out starting capacitor, or damage to other components. Let's figure out what to do to fix the problem.

What elements will need to be checked?

The most important reason for the F24 error code to be displayed by a Miele dishwasher is the water heating element activation relay. This relay is installed on the PMM control module. In the machine, it is needed in order to receive a signal from the thermostat and activate the heating element so that it begins heating the liquid for the working cycle. How to determine if a relay is faulty?

• Error F24 is not displayed instantly, but a couple of minutes after filling the water.
• When an error code appears, after a couple of seconds the Miele dishwasher pump will begin to pump out all the liquid.

If all the signs match, then you need to replace the damaged relay, which will require removing the dishwasher control module. What should I do to reset the malfunction and restore the functionality of the “home assistant”?

• Carefully disassemble the Miele dishwasher door.
• Disconnect the wiring from the control module.

Be sure to take a photo of the wiring so that during reassembly you can connect all the wires yourself without errors.

• Remove the control board.
• Replace the relay.
• Install the element and assemble the door.

The problem may be that the original relay usually costs about $80.You can purchase an analogue, but it may not fit the Miele dishwasher, or it will simply not work well, so it’s better not to take risks to save money.

Also, do not rush to eliminate the cause of the malfunction until you are sure that the relay is really faulty. To begin with, it is worth checking it with a regular multimeter, because there may be a problem in the absence of a signal between the thermostat and the PMM control board. Check all sections of the circuit, and if the cause is a breakdown, then solder the damaged components yourself if you are confident in your skills, or call a repair service specialist.

Always check your Miele dishwasher components carefully before purchasing replacement parts. It is important not only to replace the faulty element, but also to eliminate the reason why it failed. For example, if the relay of a water heating element breaks down due to a failed capacitor, then it also needs to be replaced so that it does not cause damage to the new relay.

How to “work around” this error?

A Miele dishwasher can usually be connected directly to hot water, so as not to strain the heating element in vain. Therefore, if the “home assistant” cannot heat the liquid, giving error F24 instead, then there is nothing wrong with taking advantage of this opportunity and not buying an expensive relay.

It’s very good if you have a water heater at home, because you can connect to it, set the appropriate temperature at which the Miele PMM washes dishes, wait for it to heat up and start the work cycle. This way, hot water will flow into the machine, the temperature of which will correspond to the selected washing mode.Because of this, the “home assistant” will not have to heat the liquid, so the error code will not appear and the work cycle will not be interrupted.

Depending on the dishwasher model, the user may have to set the "Hot Water" setting. The official user manual will tell you what to do to activate this function.

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