What Bosch E05 error means on your dishwasher
Error code E05 indicates a problem with the water level detection system — specifically the float switch or the water switch Triac on the main control board. The float is a small plastic disc at the bottom of the dishwasher tub that rises with the water level. When it reaches the correct height, it activates the float switch, telling the control board to stop filling. If this mechanism fails, the dishwasher cannot safely manage water levels. If you encounter the bosch e05 error, professional Bosch dishwasher repair may be needed.
Symptoms
- The dishwasher fills with water continuously and won’t stop (overflow risk)
- The dishwasher won’t fill at all — the float is stuck in the “up” position
- E05 appears on the display and the cycle aborts
- Water may be present in the base pan (the leak detection tray under the tub)
Common causes
- Stuck float — food debris, broken glass, or a fallen utensil prevents the float from moving freely
- Failed float switch — the micro-switch activated by the float mechanism has worn out
- Water in the base pan — a previous leak triggered the anti-flood float in the base of the machine. The base pan float stays raised until the water is removed
- Control board Triac failure — the electronic switch on the control board that controls the water inlet valve has failed
See all Bosch dishwasher error codes for related fault codes and diagnostic steps.
Troubleshooting steps you can try
- Check the float — remove the lower rack and locate the float (a small disc or dome) in the front corner of the tub. Press it down and release — it should move freely up and down. Remove any debris underneath it.
- Check for leaks — tilt the dishwasher slightly forward. If water drains from the base, the anti-flood system was triggered. Dry the base pan and identify the leak source.
- Power reset — turn off the breaker for 5 minutes to reset the control board.
- Check Bosch support — visit Bosch’s official dishwasher support page for model-specific troubleshooting guides and tech notes.
When to call a technician
If the float moves freely and there’s no water in the base pan, the float switch or control board Triac may need testing. A technician can measure the switch continuity and check the board’s Triac output. Float switch replacement is straightforward; a failed Triac usually means control board replacement. Codes may vary by model generation and series. Schedule a certified Bosch technician for fast, reliable diagnosis and repair.
