Is an overheating dryer dangerous?
It can be. A dryer that runs hotter than it should puts extra stress on parts, can scorch clothes, and increases fire risk, especially when lint is present. If the cabinet is too hot to touch, clothes come out very hot, or you notice a burning smell, stop using the dryer, unplug it and let it cool before you investigate.
Do not keep running a dryer you suspect is overheating just to see whether it happens again.
Signs your dryer is overheating
- Clothes are much hotter than usual at the end of a cycle.
- The top or sides of the dryer feel uncomfortably hot.
- The dryer shuts off partway through a cycle.
- Drying takes longer even though the machine feels hot.
- A burning smell, or scorched or discolored fabric.
A burning smell needs its own steps; see what to do about a dryer burning smell.
Common causes
Restricted airflow
Restricted airflow is widely described as the leading cause of overheating. If heat cannot leave through the vent, it builds up inside. Typical culprits:
- A full or coated lint filter
- A lint-filled, crushed or kinked vent duct
- A blocked exterior hood
- Lint inside the dryer’s own air path
Our guide to dryer vent issues covers how to check and clean the vent.
Overloading
Packing the drum too full limits airflow around the clothes. Dry smaller loads and see if the problem improves.
A failed thermostat or thermal part
Dryers have thermostats that switch the heat on and off, plus safety devices that cut off heat if it gets too high. If the regulating thermostat sticks, the heat may stay on longer than it should.
Heating element or gas valve problems
In an electric dryer, a damaged heating element can fail in ways that leave it energized. In a gas dryer, a problem with the burner or valve assembly can cause excess heat. Both are jobs for a technician.
A blocked or worn blower wheel
The blower wheel moves air through the dryer. Lint, a small item caught in it, or a loose or worn wheel reduces airflow.
Worn drum seals
Worn or missing felt or seals at the drum edges can disrupt how air moves through the drum.
What to check first (safe steps)
- Stop the dryer, unplug it and let it cool.
- Clean the lint filter, and wash it with warm soapy water if there is a film that blocks the mesh. Let it dry fully.
- Reduce the load size and run a short test with a small load.
- Check the transition duct for crushing or kinks and the outside hood for blockage.
- Look for lint around the lint slot and behind the dryer, without opening internal panels unless you are comfortable doing so with the power off.
If the dryer is still overheating after these checks, or you had any burning smell, stop and arrange service.
Parts that can cause overheating
A technician may test or replace the following parts, usually with a multimeter and the power disconnected:
- Cycling thermostat
- High-limit thermostat or thermal fuse (often blown after an overheating event)
- Heating element (electric dryers)
- Gas valve, igniter and burner assembly (gas dryers)
- Blower wheel
- Drum seals
These repairs involve line-voltage electrical parts or gas components. Unless you are trained and experienced, leave them to a professional. A thermal fuse that has blown is a sign something caused overheating, so replacing it without finding the cause is not a good idea.
Will a dryer shut off if it overheats?
Most dryers include safety devices, such as a high-limit thermostat or thermal fuse, that cut off the heating circuit or power when temperatures get too high. Exact behavior varies by model. If your dryer shuts off repeatedly, treat it as a warning that something is wrong, usually airflow, rather than assuming the safety device is the only fault. Never bypass, jumper or defeat a thermal fuse or high-limit thermostat, and always replace one with the exact like-for-like part.
Signs of a dying dryer
There is no single sign, but these suggest a dryer may be near the end of its useful life:
- Repeated overheating or safety shutoffs even after the vent has been cleaned
- Multiple part failures within a short time
- Visible damage, burning smells or scorch marks
- Parts that are hard to find, or repair costs that approach the price of a new machine
Age alone is not a verdict, but an older dryer with recurring heat problems is worth having a technician assess for safety as well as cost.
When to call a professional
Call a qualified appliance technician if:
- You smell burning, or you see smoke or scorching.
- The dryer shuts off repeatedly because of heat.
- Cleaning the filter and vent did not fix the problem.
- The problem seems to involve the heating element, thermostats, wiring or gas parts.
- You have a gas dryer and smell gas. In that case, leave the home and contact your gas utility or emergency services from outside.
If you see flames or smoke, do not try to fight a fire yourself; get everyone out and call emergency services.
Preventing overheating
- Clean the lint filter every load.
- Have the vent checked and cleaned regularly. More on this in our dryer vent issues guide.
- Do not overload the drum.
- Use metal ducting rather than plastic or foil accordion duct where your manual allows.
- Read tips for faster, more efficient drying in how to improve dryer performance.