Short answer: if your dryer tumbles but the clothes come out cold and damp, heat — which is a separate circuit from the motor — has failed. The top causes are a blown thermal fuse (usually triggered by a clogged vent), a dead heating element on electric models, a bad igniter or gas valve on gas models, and on electric dryers, a half-tripped 240V breaker. Start with the vent, because it's both the most common root cause and a genuine fire hazard.
1. Clean the vent first (safety + the #1 cause)
A lint-clogged vent traps heat, which trips a safety cutoff (the thermal fuse or high-limit thermostat) — so the dryer tumbles with no heat. It's also how dryer fires start. Clean the lint trap every single load, and clear the full vent duct from the dryer to the outside at least once a year. If your dryer suddenly stopped heating, do this before anything else.
2. Electric dryer? Check both breaker legs
Electric dryers use 240V — two 120V legs. The motor only needs one leg to spin the drum, but heat needs both. If half the double-pole breaker trips, the dryer tumbles with no heat at all. Flip the dryer's breaker fully OFF, then back ON. This one fixes a surprising number of "no heat" panics for free.
3. Blown thermal fuse
The thermal fuse is a one-time safety device that blows when the dryer overheats (almost always because of a clogged vent). Once it's blown, no heat — period. It needs replacing, and the underlying vent problem fixed, or the new one will blow too.
4. Heating element (electric)
The element is the coil that actually makes the heat on electric dryers. They burn out with age. If the vent's clear, the breaker's fine, and the fuse is good, a failed element is the likely answer — a common replacement.
5. Igniter, flame sensor, or gas valve (gas)
On gas dryers, no heat usually means the igniter isn't lighting the gas, or the flame sensor / gas valve coils have failed. You may hear it click and try to light without success. This is a job for a tech — gas appliances aren't a DIY guess.
When to call a pro
DIY the safe stuff: clean the lint trap and vent, reset the breaker, check the settings (make sure it's not on Air Fluff / no-heat). Call a tech for a blown thermal fuse, a failed heating element, or anything on a gas dryer — gas and the high-voltage element are not where to experiment.
If you're deciding whether it's worth it, see repair vs. replace and typical repair costs. When you're ready, GUIFIX does dryer repair on electric and gas units — $75 service call, written quote, 90-day warranty, same-day available.
Frequently Asked Questions
Why is my dryer running but not heating?
The drum turns on the motor, but heat is a separate circuit. The usual culprits are a blown thermal fuse (often caused by a clogged vent), a failed heating element on electric dryers, or a bad igniter/gas valve on gas dryers. On electric dryers, a half-tripped 240V breaker also makes it tumble with no heat.
Can a clogged dryer vent cause no heat?
Yes — and it's the cause people miss most. A blocked vent traps heat, which trips the thermal fuse or high-limit thermostat as a safety cutoff. That's also a serious fire hazard. Clean the lint trap every load and the full vent duct at least yearly.
Why does my electric dryer tumble but produce no heat?
Electric dryers run on 240V — two 120V legs. The motor only needs one leg to tumble, but heat needs both. If one leg trips (a 'half-tripped' double breaker), the dryer spins with no heat. Flip the breaker fully off, then on. If that doesn't fix it, it's likely the heating element or thermal fuse.
Is it worth repairing a dryer that won't heat?
Usually yes. Heating elements, thermal fuses, and igniters are common, affordable parts. Dryers last 10–13 years; a repair under $200 on a dryer less than 8 years old is almost always worth it.
Dryer still not working?
$75 service call · free written quote · 90-day warranty · same-day available
In Pittsburgh? See Dryer Repair in Pittsburgh.