Error F70 on a Miele dishwasher

Error F70 on a Miele dishwasher If your Miele dishwasher displays error F70, it means a leak has been detected. Sometimes the Aquastop sensor triggers falsely, or the control module may be damaged. We'll tell you how to check the PMM and what to do to reset the fault code.

Is there water in the pan?

Error code F70 appears on Miele dishwashers for various reasons. The float sensor located in the pan can change its position not only due to water accumulated there, but also when the dishwasher is installed unevenly. Sometimes the problem is a deformation of the bottom of the PMM or a change in its position (for example, if something was slipped under the machine). dishwasher tray

Therefore, inspect the dishwasher tray. If there are no signs of deformation, and the machine is installed level, make sure that there is no water in it. If it's dry inside, it's probably because the Aquastop float is faulty or its contacts are stuck.

There is a leak

Usually the F70 error displayed by a Miele dishwasher actually indicates a leak. Most often, the connection points for the PMM inlet and drain hoses leak. It could also be due to damage:

washing chamber;
circulation pump;
drain pump;
internal pipes;
sealing rubber bands.

The inlet hose of modern Miele dishwashers has a special indicator. Due to the special design, if there is a leak, the water does not go beyond the corrugation, but remains inside, while the Aquastop sensor on the pipe changes its color. In this case, you will have to replace the inlet hose; it cannot be repaired. Aquastop hose for dishwashers

If the internal parts of the PMM are damaged, then water flows into the pan.The float rises, the intelligence detects the leak and notifies the user about it with error F70. In this case, the algorithm of actions will be as follows:

Unplug your Miele dishwasher;
turn off the valve responsible for supplying water to the machine;
disconnect the PMM from communications;
remove the pan and drain the water from it;
Run a dishwasher diagnostic to locate the leak.

To reset the F70 code, you will have to eliminate the cause of the leak. For example, install a new inlet hose, replace rubber seals, damaged pipes, tighten clamps at connections, etc.

Why did the protection activate without water?

If there is definitely no leakage, and you are convinced of this, then the machine is generating the code incorrectly. This could also happen. The Aquastop system sensor is connected to the PMM control module. When moisture gets to the junction, the contacts oxidize, and this leads to their “sticking”.

As a result of contact sticking, the electronic unit incorrectly interprets information about the state of the Aquastop float sensor.

In this case, to reset error F70, you will have to check the entire circuit from the float to the control module for problems. If the problem is “sticking”, you need to clean the oxidized contacts. In some cases, sensor replacement will be necessary.

Electronic board failure

It is extremely rare that the reason for the display of error F70 on the display of a Miele dishwasher is a faulty control module. However, if all other damage is excluded, you will have to check the unit. It is he who coordinates the operation of all components and sensors of the PMM, receives information about problems and displays it on the display. Miele PMM control board

When the control module starts to work incorrectly, it displays data on the PMM display that does not correspond to reality.Because of this, the dishwasher cannot function normally. The system records a non-existent failure.

Most often, the control unit fails due to sudden changes in voltage in the electrical network. To minimize the risk of a problem, it is recommended to provide a stabilizer on the dishwasher switching line. Another possible reason is moisture getting on the board. To diagnose and repair the PMM module, you will have to invite a service center specialist.