Oven
Electric ovens usually have a failed element or thermostat; gas ovens have igniter/thermocouple faults.
Symptom: Oven stays cold or lukewarm · Typical cost: £80–£200.
You can see a broken or blistered element.
The fix:Replace the element.
The oven can’t sense or hold temperature.
The fix:Replace the thermostat/sensor.
Power doesn’t reach the elements.
The fix:Replace the switch/board.
The oven won’t light or goes out.
The fix:Gas Safe engineer must replace.
£80–£200.
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.