Dishwasher
E15
The E15 error code on an AEG dishwasher means water has been detected in the appliance’s base tray — a built-in flood protection system has triggered and stopped the machine from running. It needs attention promptly, but in many cases you can resolve it yourself.
What does this error mean?
AEG dishwashers have a polystyrene float and a safety switch (Aquastop) sitting in a shallow tray beneath the main tub. When water collects in that tray — even a small amount — the float rises, trips the switch, and the machine locks out with an E15 code. The dishwasher is working exactly as intended; it’s telling you there’s a leak somewhere that needs to be found and fixed before it will run again.
Est. repair cost
£80–£150 professional repair (labour + common parts); £15–£30 DIY door seal replacement
🔍 Likely causes
🛠️ Step-by-step fix
Tilt the machine forward carefully: turn off the dishwasher, pull it away from the cabinet, and tilt it forward at roughly 45 degrees for 1–2 minutes. This drains the water from the base tray and resets the float switch. Mop up any water on the floor first.
Level the dishwasher: use a spirit level on the floor of the open machine. Adjust the front feet so the machine sits perfectly level — a forward tilt is a common cause of repeat E15 errors.
Inspect the door seal: run your fingers around the full door gasket looking for splits, tears, or sections that have pulled away from the groove. A replacement AEG door seal costs £15–£30 and clips in without tools.
Check the detergent: if you’ve accidentally used washing-up liquid or too much powder, clean out the base, reset the machine, and run an empty cycle using the correct dishwasher tablet or powder at the recommended dose.
Remove the lower kick panel and inspect visible hoses: look for drips, water staining, or damp insulation around the inlet valve, drain hose joins, and pump connections. Tighten any loose jubilee clips — but do not attempt to dismantle the pump or inlet valve yourself.
After any fix, run a short cycle and watch for the E15 returning. If it comes back within one or two cycles, a component is still leaking and requires a professional diagnosis.
📞 When to call a professional
If the E15 returns after tilting the machine and you cannot find an obvious cause like a split door seal or loose hose, call an appliance engineer. Tell them: ‘My AEG dishwasher is showing an E15 flood protection error — the base tray is filling with water and I can’t locate the source of the leak.’ A technician will pressure-test the system and identify whether the pump seal, inlet valve, or circulation system is at fault — none of which are safe or straightforward DIY repairs.
⚖️ Repair or replace?
A professional call-out for an E15 fault typically costs £80–£150 including labour, plus parts if needed (a pump seal or inlet valve adds £20–£60). If your AEG dishwasher is under 7 years old and otherwise reliable, repair is almost always the better value. For machines over 10 years old, weigh the repair cost against a new mid-range AEG dishwasher at £400–£600 — if the repair exceeds 50% of replacement cost, it’s time to replace.