Miele Washer Error F18 — What It Means & How to Fix It

What Does This Error Mean?

F18 means your Miele washer cannot confirm the door is properly locked — or the door is stuck locked and will not release. This is usually caused by a faulty door latch, a worn door seal that jams the lock mechanism, or a defective door lock module. A power reset often resolves a temporary lock glitch; persistent F18 errors usually need the door lock assembly replaced.

Affected Models

W1 Classic
W1 TwinDos
WCR860
WDB020
WCI660

Common Causes

Faulty or worn door lock/latch assembly
Door hinge misalignment preventing the latch from seating
Door seal (gasket) bulging and obstructing the lock striker
Wiring harness connecting the door lock to the control board is loose or broken
Control board fault preventing the lock signal from being sent or received

How to Fix It

Press the Start/Stop button to cancel the cycle, then wait 2 minutes for the machine to attempt an automatic door release.

Miele washers have a built-in time delay that automatically tries to unlock the door after a cycle ends or is cancelled.
If the door remains locked, unplug the washer from the wall outlet and wait 5 minutes.

Removing power resets the electronic door lock solenoid, which often allows the mechanism to release.
Plug the washer back in and try to open the door. If it opens, inspect the door latch and the slot it clicks into on the door frame for visible damage or debris.

Lint or detergent residue around the latch can prevent it from engaging cleanly.
Check that the door closes flush — push gently on all four edges. If the door sags or feels loose, the hinge may be worn and preventing full engagement.

A door that does not close squarely puts mechanical stress on the latch every cycle.
Inspect the rubber door seal (gasket) all around the inner rim. If it is bulging outward near the latch area, push it back into its groove.

A displaced gasket is a very common cause of door lock errors on front-load washers.
If none of the above resolves the issue, the door lock module itself needs to be tested with a multimeter or replaced by a technician.

Door lock modules on Miele machines are inexpensive parts but do require front-panel access to replace.

When to Call a Professional

If a power reset does not clear F18 and the door remains stuck locked, do not force it open — you risk damaging the door hinge and seal. A Miele-certified technician can safely release the door and test whether the lock module, wiring, or control board is at fault. Door lock replacement on Miele washers is straightforward but requires correct Miele OEM parts to maintain the seal rating.

Frequently Asked Questions

Is it safe to force the door open when F18 shows?

No — forcing the door can snap the latch, tear the door hinge, or damage the door seal, turning a cheap repair into an expensive one. Always try a power reset first and call a technician if the door remains stuck.

Can F18 appear even when the door is physically closed and locked?

Yes — the error is triggered when the control board does not receive a confirmation signal from the door lock sensor, even if the door appears shut. This can happen if the sensor itself has failed or if the wiring connection is loose.

How long does a door lock module last on a Miele washer?

Most door lock modules last 8 to 12 years under normal use. Frequent overloading or slamming the door shortens that lifespan considerably.