Replacing a Float Switch to Stop an Overflowing Bosch Dishwasher

When your dishwasher fills with water, it is the float switch that is primarily responsible for shutting it off. It is this switch that keeps your dishwasher from overfilling with water by shutting the water off when triggered. If the float switch has gone faulty, you will notice that your Bosch dishwasher will overfill with water on every load. Alternatively, a faulty float switch can also prevent the dishwasher from filling with water at all by tripping too frequently.

Before you begin, you will need:

  • To disconnect the dishwasher from the power source
  • To shut off the water to your dishwasher
  • A Phillips screwdriver
  • A Flathead screwdriver (for prying)
  • A nut driver
  • A replacement float switch #165256

How to Replace a Float Switch in a Bosch Dishwasher

In order to get to the float switch, you will need to first uninstall your dishwasher. To begin, remove the screws on the bottom access panel, and set panel aside. You will then need to disconnect the water hose. Expect some water spillage. Now remove the screw on the junction block cover. You will now need to loosen the screws to release the wires. You may want to take a picture first to remember the correct wire order.

Remove the screw on the wire strain relief bracket. You can then remove the wires from the bracket itself.

Next you will need to remove the drain hose from the sink. Then, after opening the dishwasher door, remove the mounting bracket screws at the top. You can now remove the dishwasher by pulling it out.

The float switch is located on the side in the air pressure chamber. You will need to remove the hose manifold and then pull the air pressure chamber from the base and remove its wire harness. The chamber cover can be removed and the float switch can be removed.

The new float switch can then be snapped into place and the dishwasher can be reassembled and reinstalled.