Electric oven functions are locked out, display shows F5 and beeps when any oven function is selected.

Safety first: Turn off power at the mains. If the door is locked with food inside, allow the oven to cool before attempting to open.

Steps to check:

• Power reset: Isolate power for 10 minutes, then restore. Sometimes the lock motor can reset.
• Check door alignment: Ensure the oven door closes squarely and the latch tongue engages fully with the frame. Adjust hinges if the door is sagging.
• Access lock assembly: Remove the top panel or front trim (depending on model) to reach the door lock motor and microswitches.
• Inspect mechanism: Look for broken plastic parts, seized linkage, or signs of overheating. Lubricate lightly with high-temperature-safe lubricant if stiff.
• Test microswitches: With a multimeter, check continuity of the lock switches while manually operating the lock. Replace the door lock assembly if switches do not change state reliably.
• Check wiring: Verify that the lock motor and switches are firmly connected to the control PCB.
• If the lock motor is burnt or jammed: Replace the complete door lock assembly. This is usually supplied as a single Rangemaster part.