Dryer Not Heating — Common Causes & Parts
Quick answer: A dryer that runs but will not heat is almost always one of four parts, and which apply depends on whether the dryer is electric or gas. Before testing parts, confirm you have not accidentally selected an air-fluff or no-heat cycle, since cold damp clothes after a full cycle is usually a component failure.
Dryer Not Heating
A dryer that runs but won't heat is almost always one of these four parts.
Most dryers that run a full cycle but leave clothes cold and damp are dealing with a component failure, not a settings issue -- check that you have not accidentally selected an air-fluff or no-heat cycle first, since that is the one "no heat" cause that costs nothing to fix.
It also helps to separate "no heat at all" from "not enough heat": a dryer that produces some warmth but takes much longer than it used to is more often a restricted exhaust vent or a clogged lint trap than a failed part, while a dryer that produces zero heat and runs the same length of time as always is almost always one of the five parts below.
Before testing individual parts, rule out the basics: confirm the circuit breaker for the dryer has not tripped (electric dryers use a 240-volt double-pole breaker, so one tripped half can cause "runs but no heat" instead of a total no-start), and for gas dryers, confirm the gas supply valve behind the dryer is fully open.
Safety first. Appliance repair involves electricity, and depending on the appliance, gas, water lines, and moving mechanical parts.
- Unplug the appliance (or shut off the breaker) before removing any panel or touching internal components.
- Shut off the gas supply at the shutoff valve before working on a gas range, oven, or gas dryer.
- Shut off the water supply before disconnecting a hose, valve, or fitting on a washer, dishwasher, or refrigerator water line.
- Call a licensed technician if you are not confident identifying or safely accessing a part -- misdiagnosing an electrical or gas component can be dangerous.
Take a photo of any wiring or hose routing before you disconnect it, and set screws and small parts aside in the order you remove them -- this alone prevents most of the reassembly mistakes that turn a simple repair into a bigger one.
Common Causes
- Thermal Fuse (blown) — The #1 cause on electric dryers. A one-time safety fuse that blows if the dryer overheats. Cannot be reset — must be replaced. Often under $10.
- Heating Element — Burns out over time. Visible break in the coil when inspected.
- High-Limit Thermostat — Cuts power to the heater when overheating is detected. Can fail open (no heat) or closed (too hot).
- Gas Valve Coils (gas dryers) — Coils open the gas valve. If they fail, no ignition = no heat.
- Igniter (gas dryers) — Glows to ignite gas. Cracks over time and stops working.
Thermal fuse failures are almost always caused by restricted airflow -- a clogged lint trap or a blocked exhaust vent makes the dryer run hot enough to blow the fuse. Replacing the fuse without clearing the vent (see "exhaust vent clogged" and "lint trap not working") means it will very likely blow again within a few cycles.
Electric dryers only have a heating element to fail; gas dryers add the igniter and gas valve coils as extra points of failure but do not have a heating element at all, so knowing which type you have immediately rules out one or two of the five causes above.
Electric vs. Gas: Which Parts Apply to You
| Part | Electric dryer | Gas dryer |
|---|---|---|
| Thermal fuse | Applies | Applies |
| High-limit thermostat | Applies | Applies |
| Heating element | Applies | Not present |
| Igniter | Not present | Applies |
| Gas valve coils | Not present | Applies |
If you are not sure which type you have, check the power cord: a gas dryer plugs into a standard 120-volt household outlet, while an electric dryer uses a large 240-volt outlet similar to an electric range.
Quick Test
Use a multimeter to test continuity on the thermal fuse -- no continuity = blown fuse = replace it before checking anything else.
What to Check and How
- Thermal fuse: Unplug the dryer, locate the fuse on the blower housing or heater box, and test for continuity. Zero continuity means it is blown.
- Heating element: Test the coil for continuity end to end, and look for a visible gap or burnt section. No continuity or a visible break means it has failed.
- High-limit thermostat: Test for continuity at room temperature -- it should read closed (continuity present). No continuity at room temperature means it has failed.
- Gas valve coils and igniter: Start a cycle and watch the igniter -- it should glow visibly. If it glows but you never hear the valve click open, suspect the coils; if it never glows at all, suspect the igniter itself.
Related Dryer Symptoms
If your dryer is also making noise, see Appliance Making Loud Noise (dryer section). If it will not start at all, see Appliance Won't Start (dryer section). Other related searches: "thermostat not working," "drum not turning," "dryer stops mid-cycle," "dryer taking too long," and "drive belt broken."
Preventing No-Heat Failures
Clean the lint trap after every load and have the exhaust vent professionally cleaned every one to two years, more often if you notice clothes taking longer than usual to dry -- that is the single biggest factor behind thermal fuse and heating element failures, since both parts fail from running hotter than they were designed to. On gas dryers, a technician servicing the vent can also confirm the igniter and burner assembly are burning cleanly, which extends the life of both parts.
How to Confirm Before You Buy a Part
Before ordering any replacement part, take a minute to confirm the fit -- it is the difference between a repair that works the first time and a part that gets sent back.
- Find the model/serial plate. It is usually inside the door frame, on the back panel, on the door edge, or under a front kick panel, depending on the appliance. See how to find your model number for exact locations by appliance type.
- Read the full model number exactly as printed, including letters and dashes -- manufacturers often reuse near-identical model numbers across different production years that take different parts.
- Verify the part fits that model using our model and part lookup tool before ordering, rather than relying on a part looking similar to the one you are replacing.
The full model number matters more than the brand and appliance type alone: manufacturers commonly use one body design across many model numbers over several years, and change the exact door switch, control board, or pump partway through that run. Two washers that look identical sitting side by side can still take different parts if their model numbers differ, even by a single trailing letter or digit -- which is exactly why the full number, not just the brand, is what a parts lookup needs to return the correct result.
Related Symptoms
If this is not quite the problem you are seeing, check the other symptom guides, or browse the full list of 87 repair symptoms.
| Symptom | What it looks like |
|---|---|
| Appliance Won't Start | Powers on but the motor, heater, or cycle never starts |
| Appliance Leaking Water | Water pooling under, inside, or around the appliance |
| Appliance Making Loud Noise | Grinding, squealing, banging, or rattling during a cycle |
| Refrigerator Not Cooling | Fridge or freezer temperature is creeping up |
| Washer Won't Drain | Standing water left in the tub at the end of a cycle |
Still not sure? Use the model and part lookup tool to search by your appliance model number directly.