Dryer
Dryer Not Heating? Here's How to Find Out Why
Last verified September 17, 2026
Quick Answer: Likely Causes
- Blown thermal fuse (a one-time safety device — usually blows because a clogged vent let the dryer overheat)
- Failed heating element (electric dryers)
- Clogged or obstructed vent restricting airflow
- Electric dryer receiving only 120V instead of the full 240V (a partially tripped breaker)
- Gas shutoff valve closed (gas dryers only)
Where to Start
Gas and electric dryers fail differently, so check which you have before diagnosing further. Gas: confirm the shutoff valve is open — the handle should run parallel to the pipe, not across it. Electric: the dryer needs a full 240V; a partially tripped double-pole breaker can leave it with only 120V, enough to tumble but not enough to heat.
Safety Notes
- Unplug the dryer before inspecting or opening any panel.
- Gas dryers: shut off the gas supply before working anywhere near the burner assembly.
- The thermal fuse and heating element both sit behind panels that need disassembly to reach. If basic checks (vent, power, gas valve) don't restore heat, this is a reasonable point to call a professional rather than continue disassembling.
If your dryer runs, tumbles, and sounds normal, but clothes come out cold or barely warm at the end of a cycle, the cause is almost always one of a handful of things — and gas vs. electric matters from the very first check, since the failure points are different.
Gas or electric — check this first
Gas dryer: before anything else, confirm the gas shutoff valve is open. The handle should run parallel to the pipe. A closed valve produces exactly this symptom — tumbling, no heat — with nothing actually broken.
Electric dryer: these need a full 240V. A double-pole breaker that’s only partially tripped can leave the dryer with 120V — enough to run the motor and tumble the drum, but not enough to power the heating element. Check that both halves of the breaker are fully reset.
Once power and gas supply are confirmed, work through the checks below in order.
Already worked through these and have a Samsung dryer? See the Samsung-specific heating error codes and Vent Blockage Test.
Diagnostic Steps
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Check power or gas supply
- What to look for
- For gas dryers, the shutoff valve handle position. For electric, the breaker panel — specifically whether both halves of the 240V breaker are fully engaged.
- What it indicates
- A closed gas valve or a partially tripped electric breaker produces the exact symptom of 'tumbles fine, no heat' — no part has actually failed.
- What to do
- Open the gas valve fully, or fully reset the breaker (push firmly to off, then to on).
- If nothing changes
- Move to the vent and lint screen.
Clean the lint screen and check the vent path
- What to look for
- Lint buildup in the screen, and restriction anywhere along the vent from the dryer to the exterior.
- What it indicates
- A clogged vent is the most common reason a thermal fuse blows in the first place — the dryer overheats internally and the fuse does its job by cutting power to the heating circuit.
- What to do
- Clean the lint screen after every load going forward. Clear the full vent run, including at the exterior cap.
- If nothing changes
- Test the thermal fuse — but don't skip this vent check even if the fuse turns out to be the issue.
Test the thermal fuse
- What to look for
- Continuity with a multimeter (dryer unplugged).
- What it indicates
- No continuity means the fuse has blown and needs replacement. It cannot be reset — only replaced.
- What to do
- Replace the fuse, but only after confirming the vent is fully clear. Replacing the fuse without fixing an underlying clog means it blows again.
- If nothing changes
- Electric dryers: test the heating element. Gas dryers: check the igniter and gas valve coils.
Electric: test the heating element
- What to look for
- Continuity with a multimeter, and a visual check for visible breaks or burned spots on the coil.
- What it indicates
- A heating element that's burned out or has an open circuit won't produce heat even though the drum tumbles normally.
- What to do
- Replace if it fails continuity or shows visible damage.
- If nothing changes
- Check the cycling thermostat or thermistor next — a call for a professional at this point is reasonable given the disassembly involved.
Gas: check the igniter and gas valve coils
- What to look for
- Whether the igniter glows and the burner lights during a cycle.
- What it indicates
- A failed igniter or gas valve coil prevents ignition even with gas flowing and power present.
- What to do
- This is a gas-component repair — recommended to leave to a professional given the safety risk of working on gas ignition systems without experience.
- If nothing changes
- N/A — this points to professional service.
What Not to Do
- Don't replace a blown thermal fuse without also clearing the vent — the fuse will blow again if the underlying overheat cause isn't fixed.
- Don't work on gas ignition components without experience — this carries real safety risk.
When to Call a Professional
- Vent is clear, power/gas supply confirmed, and the dryer still won't heat
- Suspected internal motor damage or electrical fault
- Any gas component beyond the shutoff valve (igniter, gas valve coils)
Repair vs. Replace
A thermal fuse or heating element is a low-cost, common repair. If the dryer is older and you're facing a control-board or motor issue on top of the heating problem, weigh the total repair cost against a replacement dryer before committing.
Frequently Asked Questions
Why did my thermal fuse blow again right after I replaced it?
This almost always means the vent is still restricted somewhere. The fuse is doing its job — it trips because the dryer is overheating, and replacing it without clearing the underlying blockage just sets up the same failure again.
My dryer runs but the clothes are only slightly warm, not properly hot — same issue?
Same category of problem, often a partially working heating element or a vent that's restricted but not fully blocked. Work through the same steps.