Dryer Not Heating — Causes & Safety Checks
A dryer that tumbles but doesn't heat usually has a blown thermal fuse (often from a clogged vent), a bad thermostat, a failed heating element (electric dryers) or a failed igniter (gas dryers). Each has a clear diagnostic step. Important: lint buildup is a fire hazard — fix this even if the dryer "works".
BHGS Licensed #50446 · Same-day service · $60 diagnostic credited toward repair · Updated June 2026
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What we actually find in LA homes
Most dryers we see in LA homes are gas units, from Whirlpool, LG, Samsung and Kenmore. So a no-heat diagnosis covers the igniter and gas valve coils as well as the thermal fuse, thermostats and vent. A few dryers booked as not heating actually needed a new belt or drum rollers.
Common Causes
1. Clogged dryer vent (causes thermal fuse to blow)
The #1 cause and the most dangerous. Lint accumulates in the vent over months/years, airflow drops, dryer overheats, and the thermal fuse trips for safety. Replacing the fuse without cleaning the vent will just trip it again — and lint fires are real.
2. Failed heating element (electric dryers)
The metal coil that produces heat burns out. Dryer runs the full cycle but produces no heat. Element costs $40–$80; awkward but accessible repair.
3. Igniter or gas valve coils (gas dryers)
Gas dryers use a small igniter to light the burner. When the igniter or the gas valve coils fail, the burner doesn't light: the drum turns, but there's no heat. If you ever smell gas, follow the safety steps under When to Call a Pro.
4. High-limit thermostat
Safety thermostat that trips when the dryer overheats. Usually a symptom of the same vent-clog problem as the thermal fuse.
5. Cycling thermostat or control board
Less common. The cycling thermostat tells the heating element when to turn on/off. When it fails open, no heat at all.
What You Can Check Yourself
Try these in order — most take 5-10 minutes and many resolve the problem without a service call.
- 1
Clean the lint screen and vent (do this first)
Remove and clean the lint screen between every load, and scrub it with warm soapy water now and then. Then unplug the dryer, pull it out (gently on a gas dryer, so the gas line isn't kinked), disconnect the vent hose at the back and clean both the hose and the wall vent. Use a vent-cleaning brush from a hardware store for the wall duct. Rule this out first; it also prevents lint fires.
- 2
Check the outside vent flap
Go outside, find the vent hood on your wall or roof. The flap should open easily when the dryer is running. If it's jammed by lint or a bird nest, airflow is blocked.
- 3
Run a no-heat test cycle
Many dryers have a "Air Fluff" or "No Heat" setting. Run that to confirm the motor still turns the drum normally. If yes, electrical/heating side is the issue. If drum also won't tumble, different problem (belt, motor).
- 4
Check the gas supply (gas dryers)
Make sure the gas valve behind the dryer is fully open. If your gas range works, gas is fine. If both range and dryer have gas issues, call gas company.
- 5
Look for error codes
Modern dryers display fault codes. Look up the code in the manual or online — many "no heat" codes point directly to the failed component.
When to Call a Pro
- →Vent is clean but dryer still doesn't heat
- →Burning smell during operation (stop immediately — fire risk)
- →Gas smell: leave the house right away and call SoCalGas or 911 from outside (shut off the gas only if it's safe to). Book the repair after the utility clears the home.
- →Cycle takes 2x longer than it used to even though clothes do dry — vent partially clogged, replace before fire risk grows
Typical cost
$60 diagnostic. Thermal fuse / thermostat $120–$180. Heating element / igniter $180–$300. Vent cleaning often bundled.
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