AEG Washing Machine Error E40 — Door Lock Fix

What it means

AEG Error E40 means the door lock did not engage when the cycle started.
Check the door is fully closed, inspect the latch for damage, and perform a power reset.

How to Fix It

Open and firmly close the door

Open the washer door fully, then close it with a firm push until you hear a click.
Some AEG doors require a definite push to engage the latch catch.
Inspect the door seal

Check the rubber door gasket for items of clothing caught in the seal that may be preventing full closure.
Even a thin piece of fabric can stop the latch from engaging.
Check the door hook and catch

Inspect the plastic hook on the door edge and the catch on the machine body.
A cracked or bent hook may not push the lock mechanism far enough.
Perform a power reset

Unplug the washing machine from the wall socket.
Wait 60 seconds, then reconnect and try starting a cycle again.
A power reset often clears a temporary door lock fault.
Replace the door interlock

If the door closes correctly and a reset does not fix E40, the door interlock switch assembly may have failed.
This is a common wear part and is replaceable on most AEG front-load models.

Frequently Asked Questions

What does Error E40 mean on an AEG washing machine?

E40 means the door lock did not confirm as engaged.
The machine refuses to fill or spin without a confirmed door lock to prevent water from spraying out.

How do I open an AEG washing machine showing E40?

If the door is locked with E40, wait 3 minutes, then try the door.
If locked, perform a power reset (unplug for 60 seconds).
If still stuck and the drum has water, check E20 drainage first.

Can I fix AEG Error E40 myself?

Yes — cleaning the door seal and hook, and performing a reset, are DIY steps.
If the door interlock itself has failed, the part is inexpensive and user-replaceable with basic tools.