miele dishwasher error code f78

My Miele Dishwasher flashes Error Code F78. What does it mean?

When an error code appears on the display of your Miele dishwasher, it can be particularly stressful. The first thing that most people worry about is what the code means and how much it will cost to fix the problem. If you notice the F78 error code on your dishwasher, this is a circulation pump fault. Here are some of the common causes of this error and some solutions.

Try to clear the error code

Before you worry about whether or not something really is faulty, you can try resetting your appliance. To do so, follow these steps:

  • Turn off your dishwasher for 30 seconds.
  • Turn your dishwasher on again.
  • Select the wash cycle you wish to use.
  • Press the ‘Start’ button.

In some cases, a quick reset will resolve this problem. If this does not work, further investigation and repairs might be needed.

Door contact switch connection interruption

Every dishwasher has a contact switch located somewhere on the door. This tells the computer that the door is closed. If the computer detects that the door is open, it will not start or it will stop mid-cycle. If the switch is faulty, this can send a false signal telling the computer that the door is open. To determine whether or not this is the case, you can follow these steps:

  • Check the voltage on the electronic input and output.
  • Check the voltage on the wiring harness.
  • Check the voltage on the circulation pump.

When you find the faulty part, it will need to be replaced and retested. Once the faulty part is replaced, your dishwasher should work just as well as it did before.

Faulty circulation pump

There are a number of problems that can affect your circulation pump. These include excess or low voltage, a defective frequency converter electronic or even a blockage. Repairing the fault will depend on the fault itself. In many cases, the circulation pump will need to be replaced in order to resolve the issue.


Appliances have come a long way over the years and there are so many working parts. Diagnosing and repairing dishwasher faults require experience as well as the right tools. At Care and Repair, we are available throughout the Greater Toronto Area and you can contact us 7 days a week at (647) 812-2863 for our Miele Appliance Repair service. Our professional and speedy dishwasher repair service will ensure that your Miele dishwasher is running again in no time.