Morphy Richards oven emits a metallic banging or popping noise when heating up or cooling down.

Safety first: Allow the oven to cool before tightening any screws.

Steps:

• Identify source: Listen carefully to locate whether the noise comes from the sides, back, or top.
• Tighten fixings: With power off, remove the oven from the cabinet if necessary and tighten all accessible screws on side panels, back panel, and internal supports.
• Check racks and accessories: Ensure shelves and trays are properly seated and not flexing excessively.

Note: Some minor expansion noise is normal and not a fault.