Cooker & hob
Usually the bulb.
Symptom: Light bulb out · Typical cost: £0–£60.
Specialist heat-resistant bulb.
The fix:Replace with the right bulb.
£0–£60.
If you can see leaks, smell burning, or the appliance is tripping the electrics, stop using it and unplug it. For minor faults without those signs it is usually safe to leave it off until you can diagnose it. Always switch off and unplug the appliance before inspecting it. Never work on gas appliances or fixed electrical wiring yourself — call a Gas Safe registered engineer or a qualified electrician.