What does the AEG i40 error code mean?
i40 indicates that the AEG dishwasher’s control board cannot confirm the door is properly latched. The machine will refuse to start any programme until the door is securely closed and locked. This can be a genuine door alignment issue or a faulty door latch/interlock switch.
🔍 Symptoms
- Machine will not start any programme
- Door seems closed but machine acts as if it is open
- Door clicks but i40 persists
- Door feels loose or does not snap shut firmly
- Programme starts then immediately stops with i40
How to fix the AEG i40 error code
- Ensure no laundry, utensils, or crockery are preventing full door closure.
- Push the door firmly closed until you feel/hear a positive click from the latch.
- Inspect the door latch hook and the catch plate on the machine body for damage or misalignment.
- Adjust the door if it appears misaligned — the bottom hinge on most AEG dishwashers has an adjustment screw.
- If the latch is physically sound but i40 persists, the door interlock microswitch has failed and requires replacement.
Frequently Asked Questions (FAQ)
Q: My AEG dishwasher door clicks shut but still shows i40 — is the latch broken?
A: The physical click confirms the latch hook has engaged, but the electrical microswitch within the latch assembly may have failed. The board detects closure via electrical signal, not mechanically.
Q: Can a misaligned door cause i40 on an AEG dishwasher?
A: Yes. If the door is even slightly out of alignment, the latch hook may not press the interlock switch fully. Check whether the door hangs squarely and adjust the hinge if needed.
Q: How much does it cost to fix an AEG door latch?
A: The part typically costs £18–£40 and is straightforward to replace as a DIY job. A call-out engineer will charge an additional labour fee of £60–£100 on top of the part cost.
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