Bosch E15 means water has collected in the base tray and tripped the anti-flood float switch, which shuts the pump down to protect your floor. It is a symptom of a leak, not the leak itself, so the fix is finding and repairing the water source, not just tipping out the tray.
Every Bosch dishwasher has a shallow base tray with a float switch. If water leaks into that tray from anywhere in the machine, the float rises and trips the E15 safety, stopping the dishwasher and often running the drain pump continuously. This is by design: it prevents a slow leak from becoming a flooded kitchen. The code is doing its job.
The temptation is to tip the machine forward to drain the tray, which clears the code temporarily. But unless the leak is found, the tray refills and E15 returns on the next cycle. The common sources are a spray-arm seal, a worn sump gasket, a loose hose clamp, or a cracked salt reservoir on models that have one. Finding which requires inspecting the machine.
Once the leak source is repaired and the tray dried so the float resets, the dishwasher runs normally again. On a Bosch, E15 is almost always a mechanical seal or hose issue rather than an electronic fault, which makes it a defined, well-supported repair. We locate the source, fix it, and confirm a clean, dry cycle before finishing.
Quick Reference
| Leak Source | How It Shows | Fix |
|---|---|---|
| Spray-arm seal | Water in base tray | Replace the seal |
| Sump gasket | Leak at tub base | Replace the gasket |
| Loose hose clamp | Drip onto tray | Reseat or replace clamp |
| Cracked reservoir | Recurring E15 | Replace the component |
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