What to check, in order
- Turn the tap off
Straight away.
- Don't run it again
Not until the leak has been found and fixed.
When to call an engineer
Now. Bosch's advice is to turn off the supply tap immediately and contact customer service.
A repair visit will usually check the hoses, seals and pump housing to find where the water is coming from.
Before you book
- Note the model and serial number. They're on a label inside the door, around the door frame or on the back.
- Write down the exact code, and what the appliance was doing when it appeared.
- Check whether it's still under warranty. If it is, the repair may cost you nothing.
Checked against
Last reviewed September 2026. Manufacturers update their pages, and your manual is the final word.