AEG i30 fault codewhat it means and how to fix it
The anti-flood device has triggered — water has collected in the base of the machine. AEG say to close the water tap and call service.
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What i30 means
i30 means the anti-flood device is on, which AEG describe as indicating an internal leak caused by water collecting in the base of the appliance. Their instruction is unambiguous: close the water tap and contact an authorised service centre, with a warning to turn off the water supply to avoid any risk of flooding. It is worth understanding what the machine is actually doing, because the symptom confuses people. There is a float switch sitting in a tray beneath the tub. When water collects there and lifts the float, the machine shuts off every electrical component except the drain pump, and runs that pump continuously to keep the tray empty. So the classic presentation of i30 is not a puddle — it is a dishwasher that will not do anything except emit a constant low hum, indefinitely, and AEG list exactly that as a symptom. That hum is the protection working. The thing not to do is the fix the internet agrees on. Tipping the machine onto its side or back to empty the tray and drop the float does clear the code, and it addresses nothing: the water got into the tray from somewhere, and you have just emptied the only thing that was telling you so.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Internal hose or connection leaking | A perished hose or a slipped clip dripping into the base tray. Common, and among the cheaper outcomes once the leak is actually found. | Common |
| Door seal perished at the lower corners | Water running down the inside of the door and collecting underneath rather than escaping at the front where you would see it. | Occasional |
| Tub or sump leaking | A split or a failed seal at the bottom of the tub itself. More serious, and the reason a diagnosis has to come before a price. | Occasional |
| Excess foam overflowing into the base | Washing-up liquid in the detergent compartment produces enough foam to escape the tub entirely and trip the float without anything having failed. | Occasional |
| Float switch stuck or faulty | The protection reporting water that has gone. Real, but concluded after a leak has been ruled out rather than assumed at the start. | Rare |
Can you fix it yourself?
Stop — this needs an engineer
What it costs to fix
Typical repair cost
£90–£260
A hose or clip repair is typically £90 to £160. A tub or sump seal is £150 to £260 because considerably more has to come apart. The leak has to be found before anyone can price it honestly.
Typical UK prices including parts and labour, updated August 2026. Your quote may differ.
What other owners found
Nobody has shared what worked for them on this code yet. If you have had it, you would be the first — and it genuinely helps the next person.
Related AEG fault codes
- E15Stop — call an engineerThe water protection system has activated — there is water in the base of the machine. Turn the tap off and call service. Do not tilt it, whatever else you read.Related: flood protection
- F01Stop — call an engineerAnti-flooding overflow. The one code in the Hotpoint list that offers no owner check at all — it goes straight to an engineer.Related: flood protection
- F70Stop — call an engineerThe Waterproof System has activated. Miele give the clearest emergency instruction of any dishwasher manufacturer — close the stopcock, switch off, unplug, call.Related: flood protection
- E4Stop — call an engineerA water leak. Candy specifically warn against tilting or moving the machine, which rules out the fix most often recommended online.Related: flood protection
- AEStop — call an engineerLG’s leak code. LG tell you to call for service if it happens again — we think that is the wrong advice and explain why.Related: flood protection
- E01Stop — call an engineerWater in the chassis. Beko’s own instruction is to cut off the electricity and close the valve — the bluntest wording of any brand we cover.Related: flood protection
Common questions about AEG i30
What should I do right now?
Close the water tap feeding the machine, which is AEG’s own first instruction, then switch it off at the wall. Their warning is to turn off the water supply to avoid any risk of flooding. Then book someone rather than trying to clear it.
Why is the pump running constantly?
Because that is the design. When the float lifts, the machine cuts power to everything except the drain pump and runs it to keep the base tray empty. The constant hum with nothing else happening is the anti-flood system holding the line, not a pump that has gone wrong.
Can I just tip the machine to drain the tray?
You can, and it will clear the code, and it is a bad idea. It empties the tray without touching whatever filled it, and it resets the one device standing between a slow leak and your kitchen floor. A dishwasher leaks under a worktop where nobody sees it, usually overnight — which is precisely why the float is there.
There is no water on my floor, so is it a false alarm?
Unlikely, and the dry floor is the point. The tray catches the leak before it reaches your kitchen. What you cannot see is not evidence that nothing is happening.
Could washing-up liquid have caused it?
Yes, and it is worth saying if it happened. Washing-up liquid foams enormously in a dishwasher, and enough foam will come over the top of the tub and into the base. Mention it when you book, because it changes what the engineer looks for.
Sources and how we verified this
We establish the facts from the sources below and then write the explanation ourselves. We do not copy manufacturer wording and we do not host their manuals.
- Manufacturer support portal
- Manufacturer technical and service documentation
Checked by Appliance technical reviewer (Qualifications to be displayed on appointment) on 5 August 2026.