Error E20 in the Bosch dishwasher indicates problems in the operation of the circulation pump, its parts or winding. We’ll figure out how to fix the problem without the help of a wizard.
You can find the decoding of other error codes that the Bosch dishwasher displays on the display in a separate article.
The causes of the malfunction
The circulation unit fails extremely rarely, therefore, before disassembling and checking the element, you need to check the drainage system. A blockage could form in the filter, or the impeller of the pump would be blocked by debris. For these reasons, the system also displays the E 20 code on the scoreboard.
What could affect the failure of the circulation pump:
- Power surges could lead to a break in the winding.
- Water has entered the electronic parts.
- Burned out heating element.
To fix the problem, you need to check everything in sequence.
How to fix a breakdown yourself
Try to clear the error right away, maybe it's just a system failure. For this:
- unplug the machine;
- wait 10-15 minutes;
- run the PMM and look at the screen.
Are the icons highlighted again? Then proceed to cleaning the filter. What do we have to do:
- Open the hopper door.
- Remove the basket for dishes.
- Unscrew the drain filter, which is located in the pan.
- Rinse it under the pressure of water or clean it with a brush.
- A drain pump is located behind the filter.
- Pump the water out of the hole with a sponge.
- Remove the fastening screws.
- Pull and remove the cover.
- Check impeller for blockage.
How to understand that the circulation pump does not work: when operating the PMM, you will not hear the unit buzzing. To check or replace a part, you need to disassemble the Bosch dishwasher:
- Remove all baskets from the camera.
- Disconnect the machine from communications, unplug the plug.
- Turn the technique “on your back”.
- Remove the screws or unfasten the latches on the bottom panel.
- Carefully inspect the wiring at the time of burning.
- Remove the drain pump and the heater; check for operability.
Diagnostics of parts and windings of the unit is carried out by a tester with a multimeter. To do this, the probes are applied to the contacts of the elements, the resistance is measured.
If one of the parts is defective, install a new one. How to replace the heater in the dishwasher, read in this article.
Check the dishwasher yourself. If you decide to replace parts, select only original spare parts for your PMM Bosch model.