Oven shows E4 and does not heat; some models may beep continuously.

Safety first: Isolate the oven from mains power before removing any panels or attempting to access the lock.

• Check door closure: Ensure the door closes fully and the latch engages firmly. Look for bent hinges or a distorted door seal preventing full closure.
• Inspect latch hook: Open the door and inspect the metal latch hook at the top or side. If bent, carefully straighten it so it aligns with the lock mechanism.
• Access door lock: Remove the top/front panel (depending on model) to access the door lock motor assembly. Check that the wiring connector is secure and not burnt.
• Manual test: With power disconnected, operate the lock lever by hand (if accessible) to ensure it moves freely. If jammed or noisy, the lock assembly should be replaced.
• Replace faulty lock: Remove mounting screws, disconnect the wiring plug, and fit a compatible Russell Hobbs door lock assembly. Reassemble and test.