Washer-dryer shows E40 and will not start, often accompanied by beeping on Xiaomi combo washer-dryer.

Safety first: Do not slam the door; glass can break.

• 1. Close door firmly: Remove any clothing trapped in the seal and push the door until you hear a click.
• 2. Inspect hinge and latch: Check that the door is level and not sagging. Tighten hinge screws if loose. Inspect the latch hook for damage.
• 3. Clean door strike area: Wipe away detergent residue or lint that may prevent full engagement.
• 4. If E40 persists: The door lock switch inside the Xiaomi door lock assembly may be faulty. Replacement of the door lock is usually required.