Bosch · Dishwasher · Error code
E15 – Water leak detected in base tray
E15 means the safety float in the base tray has detected water, so the dishwasher shuts off the inlet valve to prevent flooding.
Smart summary for E15
This quick AI-style overview sums up how serious this error is, how hard it usually is to fix yourself and roughly how long it takes.
What E15 means
On most Bosch dishwashers, error E15 indicates that water has collected in the base tray. A float switch rises when there is water in the tray and signals the control board to stop the cycle and close the water inlet valve.
Common causes
- Leaking door seal allowing drips down into the base tray
- Loose or cracked sump, circulation pump seal or hose clamp
- Over-foaming from incorrect detergent or too much rinse aid causing water to spill over
- Small hairline cracks in plastic side tanks or heat exchanger
Quick checks you can do yourself
- Switch off the dishwasher at the mains and carefully pull it out enough to tilt it without straining hoses.
- Place towels behind the machine and gently tilt it backwards around 45° so trapped water in the base can run out.
- Stand the dishwasher upright and leave it for at least 30–60 minutes so the float and base area can dry.
- Check the door seal, sump area and visible hoses with a torch for signs of fresh water trails or dried detergent marks.
- Run a short rinse cycle while watching the sides and underneath the machine for new leaks.
Always unplug the appliance and switch off power at the mains before removing panels or working near wiring or water connections.
When to call a professional
If E15 comes back quickly after drying the base tray, or you can see water coming from the circulation pump area, sump or a side tank, the leak is more than just a one-off spill. A Bosch-trained engineer should inspect the appliance, as replacing pumps, tanks or seals often requires partial strip‑down.
Recommended next steps
If the error clears and no new water appears, monitor the dishwasher closely over the next few cycles. Avoid overloading the lower basket so the door does not flex, use the correct tablets or detergent and clean the filters regularly. If you see new puddles or the E15 error returns, stop using the appliance until the leak source is found.
Typical repair cost
£0–£180. Drying out a one-off leak can be free; replacing a sump, hose or side tank typically costs £80–£180 including labour.
How to prevent this error in future
- Use the correct dishwasher detergent and dose to avoid over‑foaming that can spill into the base tray.
- Clean door seals and wipe away residue regularly so they can seal properly.
- Check for kinks or strain on hoses when the machine is pushed back under the worktop.
- Fix small drips or damp patches quickly rather than running the appliance until the tray fills again.
Recommended parts & cleaners
The link below searches for compatible parts, hoses and cleaners that may help resolve E15 issues on your Bosch dishwasher. Always check compatibility with your exact model before ordering.
View related parts on Amazon Open Amazon search →FAQs for E15
What does E15 mean on a Bosch dishwasher?
On most Bosch dishwashers, error E15 indicates that water has collected in the base tray. A float switch rises when there is water in the tray and signals the control board to stop the cycle and close the water inlet valve.
Can I keep using the dishwasher with error E15?
Usually you can do basic checks safely, but if you notice leaks, burning smells, unusual noises, or tripped electrics, stop and investigate before continuing.
How do I reset a Bosch dishwasher after this error?
A safe first reset is to power the appliance off at the socket (or isolator) for 60 seconds, then turn it back on. If the error returns immediately, focus on the causes listed above rather than repeated resets.
What is the most common fix for E15?
Most commonly: Leaking door seal allowing drips down into the base tray. Start with the first DIY checks and work down the list.
About this guide
This guide was created by the CodeSolveAI Appliance Help Team. We use manufacturer information, typical engineer reports and safe DIY practice to keep these pages up to date and practical.
Last reviewed: March 2026.
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