The short answer
On an AEG the machine's own protection usually acts before the house protection does: water in the base tray lifts the float, the machine stops and pumps out, and nothing trips. When the house protection does trip, the heater built into the circulation pump is the leading suspect, because on this platform the heater and the pump are one part sitting in water. Isolate at the breaker — the plug is behind the cabinet.
What you observe
- Trips protection once the wash water starts heating — The heater phase. On this platform that points at the heating circulation pump.
- Machine stops, pumps out continuously, will not accept a programme — The anti-flood float has lifted. That is the machine protecting itself, not an electrical fault.
- Hot or fishy smell from the cabinet area — Overheating at a connector or in the mains filter. Stop the machine.
- Trips the whole house rather than its own circuit — Earth leakage rather than overload — the classic signature of a wet heater.
- NEAR MISS — dead display, nothing tripped — That is a supply, door-switch or board fault, and belongs on a different page.
Causes, most likely first on this brand
- Heating circulation pump leaking to earth — First on AEG specifically, because the heater is not a separate element in the sump — it is integral to the circulating pump, permanently in the water path. When its insulation degrades it leaks to earth under load, which is why the trip arrives at the heat phase and repeats at the same point every cycle.
- Water in the base tray and the anti-flood float — Second. A leak from a hose, the door seal or the sump collects in the tray, the float rises, and the machine refuses to run while it pumps out. Owners read a machine that will not start as electrical; it is plumbing, and the safety system is working exactly as intended.
- Mains filter and connector degradation — Third. The suppression filter at the mains inlet ages and can develop leakage of its own, and the connectors behind a built-in machine sit in a warm cabinet. A hot smell without a trip usually starts here.
- Inlet hose valve cable and board faults — Last. The inlet hose carries a solenoid and its cable is flexed every time the machine is pulled out for service; damage there is a real cause but an uncommon one, and boards fail by not working rather than by tripping.
Check in this order, and why
- Establish whether the machine stopped itself or the breaker tripped — Those are two different faults and the first question separates them completely.
- Note the point in the cycle at which it trips — A repeatable trip at the heat phase points at the heating pump; a random one points at a connection.
- Look for water on the floor of the cabinet and under the machine — Follows naturally: the anti-flood system is telling you where to look before you open anything.
- Check whether it trips the machine circuit or the whole board — Whole-board tripping means earth leakage, which is the end of owner diagnosis on this machine.
What an owner can safely check
- Switch the machine off at its breaker — The plug is behind the cabinet and pulling the machine out on a live cord risks the hoses as much as the cable.
About 5 min
- Look for water under and in front of the machine — A wet plinth or a damp cabinet floor explains the anti-flood stop without opening anything.
Tools: torch, dry clothAbout 10 min
- Check the inlet hose and the drain connection at the sink trap — Most base-tray water arrives from a joint that was disturbed the last time the sink was worked on.
Tools: hand toolsAbout 15 min
- Clean the filter and check the door seal for trapped debris — A seal held open by a fragment leaks to the floor and eventually into the tray.
About 15 min
- STOP HERE — testing the heating pump needs isolation and a meter — Insulation testing on a wet heater is service work and cannot be done by feel.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. On a built-in machine, isolate at the breaker rather than trying to reach a plug behind the cabinet. Never tip a machine that still has water in its base tray towards the electrics, never defeat the anti-flood float to get a cycle to run, and never re-arm a breaker repeatedly to finish a wash.
When to call a technician
Call when the machine trips protection repeatably at the heat phase, when it trips the whole installation rather than its own circuit, and on any hot smell. Call when the anti-flood system keeps operating after the visible joints have been checked, because the leak is then inside the cabinet.
Nearest pages of this class
What this page does not cover
This page covers AEG dishwashers as a class and not one family or model line. Pump and heater fitment, filter types, door-seal profiles and connector layouts differ by platform and belong on the family page where one exists — that page is the more specific answer.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
