Dryer Not Heating? Safe Checks and When to Call a Technician

No heat: the quick answer

• Electric dryer: check both halves of the double breaker. One can trip and leave the drum turning with no heat.
• Gas dryer: make sure the gas shutoff valve behind the dryer is open.
• Check the cycle setting, clean the lint screen and feel for strong warm air at the outside vent.
• A clogged vent often causes the no-heat problem, so clear it before replacing parts.
• If power, gas and airflow are fine and there is still no heat, a heating part has failed and a technician should test it.

Quick checks you can do safely

• Breakers (electric dryers). An electric dryer runs on a 240-volt circuit with a double breaker. One half runs the motor and the other the heat, so one half can trip while the drum still turns and the light works. Switch the breaker fully off, then back on. If you have fuses, check both.
• Gas supply (gas dryers). A gas dryer will tumble but not heat if the gas valve is closed. The valve is open when its handle is parallel to the gas pipe. If other gas appliances are not working either, call your gas provider.
• Cycle and settings. Make sure the dryer is not on air fluff, a no-heat setting or a delicate cycle that runs very low heat.
• Lint screen and housing. Clean the screen, then shine a flashlight into the slot it sits in. Lint packed below the screen restricts airflow.
• Outside vent. Run the dryer and go outside. You should feel strong, warm air at the vent hood, and the flap should open fully. Weak airflow means the vent is restricted.

Why the vent matters so much

A dryer has safety devices that cut the heat when it gets too hot inside. A clogged vent traps hot air, so the dryer overheats and those devices shut the heat off. On many electric dryers, repeated overheating eventually blows a one-time thermal fuse, and the dryer stops heating altogether.

That is why a vent problem so often shows up as a no-heat problem. Replacing the fuse or heating part without clearing the vent usually means it fails again.

Long vent runs, crushed foil or plastic transition hoses behind the dryer, and bird nests or lint in the outside hood are the usual culprits. The U.S. Fire Administration recommends rigid or flexible metal venting and warns against plastic or foil vents, which can sag and trap lint.

The parts that usually fail

Electric dryers: the heating element, the thermal fuse, the high-limit thermostat or the cycling thermostat. A broken element coil is common. A blown thermal fuse often means the dryer overheated, which points back to the vent.

Gas dryers: the igniter, the flame sensor or the gas valve coils. A common pattern is a dryer that heats for a while, then goes cold mid-cycle as the valve coils weaken. If the igniter glows but the burner never lights, the coils or the flame sensor are likely suspects.

Each part can be tested with a meter. A careful technician tests them in order and replaces only what failed, then checks airflow so the new part is not the next to go. Ask the technician how they will confirm which part failed before any part is replaced.

If it heats but takes too long

A dryer that is warm but needs two cycles almost always has an airflow problem. Clean the lint screen, check the hose behind the dryer for kinks and have the vent run cleaned.

Other causes are overloading the drum, clothes coming out of the washer too wet because it is not spinning fully, or a moisture sensor coated with residue from dryer sheets that ends cycles early. You can clean the sensor bars inside the drum with a little rubbing alcohol on a cloth.

When a cold dryer needs a technician

Call when the breakers, gas supply and airflow are fine and there is still no heat, or when it heats for a while and then goes cold.

Stop using the dryer and call right away if it smells like burning, the top or sides feel very hot, or you see scorch marks on clothes. If you smell gas, do not switch anything on or off. Leave the house and call your gas provider or 911 from outside.

On the call, give the brand, the model number from the door frame or back panel, gas or electric, and what you have ruled out: breaker, gas valve, lint screen and outside vent. If it heats and then goes cold, say so, because that pattern narrows the parts to test.