Common causes of outlet heating
A loose terminal increases resistance and temperature. Worn contacts, a damaged plug, high appliance load, ageing aluminium wiring or an unsuitable extension lead can also be responsible.
What to do immediately
Unplug the appliance if this is safe and the plug has not melted. Turn off the circuit for severe heat, smoke or crackling. Never use water on electrical equipment.
Why replacing the faceplate may not be enough
The electrician checks the mechanism, cable, terminals, box, plug and circuit load. Heat-damaged insulation or conductor must be repaired, not hidden behind a new outlet.
When a dedicated circuit is needed
Water heaters, ovens and hobs may require a dedicated cable and protection. The decision depends on appliance power, cable size and installation method.
What to show the electrician
Send clear photos of the outlet, plug, heat marks and board. State appliance power and how long it takes for heat to appear.
Frequently asked questions
Is a tiny spark when plugging in normal?
A brief small spark can occur as a load connects, but strong repeated arcing, crackling or heat requires inspection.
Can I replace the outlet myself?
The supply must be isolated and proved dead, and damaged wiring assessed. Heat damage is a good reason to use an electrician.
Why does an extension lead get hot?
Overload, undersized cable, a coiled reel or weak contacts can cause heat. High-power appliances should not use a random extension lead.