Washer-dryer displays E40 and refuses to start; often accompanied by a door symbol on the display.

Safety first: Ensure the machine is stable and unplugged before adjusting hinges.

• Close door firmly: Push the door closed until you hear a positive click. Avoid slamming.
• Inspect hinge alignment: Check if the door sags or rubs on the cabinet. Tighten hinge screws and gently lift the door while tightening if needed.
• Check door catch: Look for wear or damage on the plastic catch. Replace if rounded or cracked.
• Door lock test: With the machine plugged in, start a cycle and listen for the door lock click. If there is no click and E40 appears, the door lock may be faulty and should be replaced.