Room Heater Not Working? What to Check and When to Stop

A heater problem can be a minor annoyance or a fire risk, and the first job is to tell them apart. This guide starts with checks that are safe for anyone, and it is clear about where to stop and call a technician.

Safety first. Unplug the heater before cleaning or inspecting it. Never open a plugged-in unit. Do not use a heater that smells strongly of burning, has a damaged cord or plug, or has melted plastic.

Start here

1. Is it getting power? Try another socket or appliance in the same socket.
2. Is the thermostat or heat setting turned down?
3. Is the unit upright and level? Most heaters have a tip-over switch.
4. Did it overheat and cut out? Let it cool, then check vents.
5. Does the fan run but not the heat? That points to the element.

Check 1: Power and socket

Heaters have high loads. Plug the heater directly into a wall socket and check the MCB. A loose, warm or discoloured socket and plug is a warning sign. Stop using that socket and call an electrician. If the MCB trips each time you switch the heater on, stop and have the wiring and the heater checked.

Check 2: Settings

A heater with a thermostat will cut the heat when the room reaches the set temperature. If it is set low, or the room is already warm, the element will stay off. Turn it up to confirm.

Check 3: Tip-over switch

Many heaters have a safety switch that cuts power if the unit is tilted or on a soft surface. Place it on a hard, flat floor and try again. Do not bypass the switch.

Check 4: Overheat protection and dust

Vents clogged with dust trap heat, and the overheat cut-out may switch the heater off. Unplug it, let it cool fully, and clean the vents gently with a dry brush or a vacuum cleaner. Do not use water. Keep at least a metre clear of curtains, bedding and furniture.

Check 5: The element

If the fan runs but you get no heat, or heat comes only from some rods or elements in a multi-rod heater, one or more heating elements may have failed. In a quartz or halogen heater, a visibly broken or dark rod is a sign. Replacement should be done by the service centre, since the element wiring carries mains current.

Check 6: Oil-filled heaters

Oil-filled heaters take several minutes to feel warm, so give them time. If the panel is cold after that, or oil is leaking, stop using it. Do not open an oil-filled radiator.

Check 7: Cord and plug

Inspect the cord for cuts, kinks or a warm plug. A damaged cord means the heater should not be used until repaired.

When to stop and call a technician

• The MCB trips
• A strong burning smell, smoke or sparks
• Melted plug, socket or casing
• Fan runs, heat does not
• Oil leak from an oil-filled radiator

Using a heater safely

• Use only one heavy appliance per socket.
• Do not dry clothes on a heater.
• Switch it off when you sleep or leave the house unless the heater has a timer and you are comfortable with it.
• Keep children and pets away.
• Ensure ventilation, especially with fan or halogen heaters.

If your heater is old or repairs are no longer worth it, see our guides to room heaters for home and oil-filled room heaters.

Affiliate note: if you buy through our links we may earn a commission at no extra cost to you. It does not change what we write.