Morphy Richards oven shows E4 and will not start any heating function.

Safety first: Turn off power at the mains before removing any panels. Do not force the door open with tools.

Troubleshooting steps:

• Check door closure: Ensure the door is fully closed and not obstructed by racks or trays. Inspect the latch hook for damage or bending.
• Listen for lock motor: On models with an electronic lock (often for pyrolytic/self-clean), you should hear a brief motor sound when starting a cycle. If silent, suspect the door lock motor assembly or control board.
• Access the lock: Remove the top/front panel to access the door lock mechanism. Inspect for broken plastic parts, loose screws, or disconnected rods.
• Test the door switch: Many Morphy Richards ovens use a microswitch on the lock or frame. With the door closed, test continuity across the switch terminals. Replace if it does not change state when the door is opened/closed.
• Check wiring: Inspect the harness from the lock/switch to the control PCB for pinched or burnt wires. Reseat connectors.
• Replace faulty parts: Replace the door lock assembly or door switch if defective. If the lock receives power but does not move, the motor is likely failed.

Warning: If the door is locked shut and you cannot open it, contact a professional to avoid damaging the glass or hinges.