How to replace a Bosch dishwasher safety device

PMM Bosch repair Any modern equipment is necessarily protected from electrical overloads. Such protection is provided for by safety rules; a household appliance without such protection will not receive a quality certificate. The safety device for a Bosch dishwasher can be found in the power board, which is located in a special plastic case at the base of the power cord. What exactly is this device used for, how can you tell if it’s broken and how can you replace it? We will look for answers to all these questions.

Purpose of the fuse

It’s not difficult to guess what the fuse is for in a Bosch dishwasher. It serves to take the blow in the event of an overload in the electrical network, thus protecting the electrics, and most importantly the electronics of the dishwasher. The principle of operation of the fuse is simple; at a certain moment it must break the circuit, de-energizing the device and interrupting the harmful effects of voltage on it.

If there was no fuse, the power surge would fry the wiring in the dishwasher and burn out all the microcircuits.

The very first fuses were disposable. After a negative impact, the device burned out and had to be replaced with a new one. Modern safety systems are able to recover after rebooting the device. It is enough to completely turn off the dishwasher and then turn it on again and the fuse will function again. But this is under normal conditions.Sometimes power boards along with fuses suffer especially badly and then you have to repair them or even change them, but first you need to understand that the problem is in these parts.

Where can I find it?

If the fuse fails, the Bosch dishwasher stops turning on completely. With such symptoms, if the socket is working properly and the power cord is intact, you won’t even think about any other part. Only the fuse can blow here. Where is the safety system located? Finding it couldn't be easier.

First, look at the place on the dishwasher body where the power cord fits.
At the base of the cord there is probably a technological hatch with a plug, which is inserted into grooves or screwed onto screws.
We turn off the power to the machine, remove the plug and gain access to the required part.

Having reached the fuse, you can immediately inspect the wiring soldered to it and the semiconductor elements themselves. Often a failed fuse has traces of soot; this is the clearest sign that the part has outlived its usefulness. To clear your conscience, you can take out a multimeter and test the fuse and the wires that go to it. The device will tell you more accurately, but it will already be intuitively clear that you need to buy a new spare part. A new part will cost about $20, but you can look for cheaper.

How to change it yourself?

Replacing a Bosch dishwasher fuse is not the most difficult task. To remove the old part, you need to photograph it so as not to mix up the wires later. Next you need to disconnect all the wires that go to it. On some models, the wires are soldered, so you will have to use a soldering iron. Soldered wires should never be torn off. Be careful to unsolder each wire and then bend them to the side so they are out of the way. Then do this:

unscrew the fastening element holding the fuse in the retainer and remove the failed part;
take the new fuse, make sure that it is identical to the old one, and then stick it into the retainer and secure it in place;
after looking at the photograph you took earlier, carefully connect all the wiring and solder them if necessary;
plug the power cord into the outlet and make sure that the control module is receiving power;
return the plug to its place and you can start the dishwasher.

If before or after repair dishwasher electrocutes, which means that most likely the power wire is in contact with the dishwasher body somewhere. This is very life-threatening. It is necessary to immediately turn off the power to the “home assistant” in order to find the leak and fix it. If you are afraid to do it yourself, invite a specialist, it’s even better.

In conclusion, we note that almost anyone can find and replace a power board with a fuse. The main thing here is to follow safety precautions and do everything carefully. Read the instructions contained in this publication again and go for it. Good luck!