Dryer Not Heating? 4 Causes — Plus a Fire-Safety Check You Must Do
From working LA appliance repair technicians. Different causes for gas vs. electric — and one safety issue you cannot skip.
The fire-safety check most people skip
Before diving into specific causes — ask yourself: when did I last have my dryer vent cleaned?
If you can’t remember, or it’s been over 12 months, that’s almost certainly contributing to your “not heating” problem. And it’s a real fire safety issue: the U.S. Fire Administration reports clogged dryer vents as the leading cause of approximately 2,900 dryer-related residential fires per year in the United States.
LA’s dry climate accelerates lint accumulation. Vent runs in townhomes and apartments are often longer than typical and have more bends, both of which slow air flow and trap lint.
Recommendation: annual professional vent cleaning if you run 4+ loads per week. Every 6 months for heavier use households.
Vent cleaning is genuinely a fire-prevention service, not an upsell. We do them at $140-$220 standalone, or bundled with any dryer repair at a discount.
The 4 causes ranked by frequency
| Likelihood | Cause | Type | Typical cost |
|---|---|---|---|
| 35% | Clogged vent → tripped thermal switch | Both gas/electric | $140–$240 (vent clean + thermal switch) |
| 25% | Blown thermal fuse (root: vent clog) | Both | $150–$240 (fuse + vent clean) |
| 25% | Heating element OR igniter failure | Element=electric, igniter=gas | $180–$320 |
| 15% | Cycling thermostat failure | Both | $200–$320 |
Notice the pattern: 60% of “not heating” calls have venting as a root or contributing cause. Any technician who replaces the thermal fuse without checking vent airflow is setting you up to call back in weeks.
Electric dryer specifics
Electric dryers use a high-resistance heating element on a dedicated 240V circuit. Failures specific to electric:
- Heating element failure: most common over 8-12 years. Element burns out. Replacement is $220-$320 typically including labor. The element is visible behind the back panel.
- High-limit thermostat: safety device that shuts off heat if dryer overheats. Failure causes total heat loss. Replacement $200-$300.
- 240V circuit issue: rare but possible. One leg of the 240V power gets cut (faulty breaker, faulty outlet, faulty cord) — dryer runs on 120V (motor and timer work) but can’t heat (which requires both 240V legs). Diagnosis requires multimeter testing.
Gas dryer specifics
Gas dryers ignite gas at a burner to produce heat. Failures specific to gas:
- Igniter failure: most common at 5-10 years. Igniter glows but doesn’t ignite gas (cracked igniter), or doesn’t glow at all. Replacement $180-$280.
- Gas valve solenoid failure: the valve that releases gas to the burner. If solenoid fails, igniter glows but no gas flows. Replacement $240-$380.
- Flame sensor: detects flame to allow continued gas flow. Failed sensor cuts gas after ignition. Replacement $180-$240.
- Gas supply issues: low pressure, supply valve closed, wrong gas type (LP vs. natural). Diagnosis varies.
DIY checks (safe with dryer unplugged)
- Clean the lint trap thoroughly. Vacuum the lint trap housing as well as the screen.
- Pull the dryer out and inspect the vent at the back. Disconnect the vent hose. Is lint visible at the connection?
- Check the lint trap area for obstruction. Some dryers have a secondary lint trap inside.
- Listen during a cycle (briefly, with dryer empty). Gas dryers should have an audible “click” when igniter sparks. Electric dryers should be silent but hot.
If these checks don’t reveal the issue, internal repair is needed.
When we arrive
Our diagnostic process for “not heating” calls (the same one behind our dryer repair service):
- Test the vent for airflow restriction (anemometer or pressure test)
- Check the lint trap and internal lint filter
- Test thermal fuse continuity
- For electric: test heating element resistance
- For gas: test igniter resistance, gas valve solenoid
- Test cycling thermostat
Typical diagnosis time: 15-20 minutes. Repair time: 30-60 minutes depending on parts.
When replacement makes more sense
If your dryer is 12+ years old AND the failure is the heating element AND the vent system needs major work: evaluate replacement. A new mid-range dryer runs $700-$1,200; major repair on an old unit may not deliver good value — our LA repair cost guide breaks down the math.
Premium gas dryers (Miele especially) often justify repair past 15 years given replacement costs. Mainstream dryers — case by case.
Seeing a dryer error code?
If your dryer is displaying a fault code (E1, E2, dE, F-series, etc.), look it up in our Dryer Error Code Database for model-specific meaning and fix steps.
Call (213) 205-2055
Or text a photo of your dryer. Mention if it’s gas or electric (gas dryers have a gas line connection at the back; electric dryers have a 240V plug).
FAQ
Why is my dryer running but not heating?
Four common causes: (1) Clogged dryer vent — restricted airflow trips a safety thermal switch that shuts off heat. This is also the #1 cause of dryer fires. (2) Blown thermal fuse — often caused by the clogged vent. (3) Failed heating element (electric) or igniter/gas valve solenoid (gas). (4) Cycling thermostat failure. About 60% of 'not heating' calls trace to the first two — both rooted in inadequate venting maintenance.
How do I know if my dryer vent is clogged?
Signs: clothes take longer to dry than they used to, dryer feels excessively hot to the touch during operation, lint visibly accumulating around the door seal, burning smell during operation, dryer shuts off mid-cycle (thermal switch tripping). If you can't remember the last time you had the vent cleaned, it's overdue. Annual vent cleaning is recommended for households running 4+ loads per week.
Why is dryer vent cleaning a fire safety issue?
Lint is highly flammable. As vents clog, hot air can't escape, dryer cabinet overheats, and any spark (from the heating element, igniter, or motor brushes) can ignite the lint. The U.S. Fire Administration reports approximately 2,900 dryer-related residential fires per year nationwide, with 'failure to clean' as the leading factor. LA's dry climate accelerates lint accumulation. Annual professional vent cleaning is genuinely a fire-prevention measure, not a luxury service.
How much does it cost to fix a dryer that won't heat?
Most repairs cost $180–$420 in LA. Thermal fuse replacement (cheapest, often most common) $150–$240. Heating element (electric) $220–$320. Igniter (gas) $180–$280. Gas valve solenoid $240–$380. Cycling thermostat $200–$320. Dryer vent cleaning is $140–$220 and we strongly recommend bundling it with any 'not heating' repair — clogged vents cause many of these failures and the root cause needs addressing.
What's the difference between gas and electric dryer heating issues?
Gas dryers use an igniter to ignite gas at the burner — failures include the igniter itself, the gas valve solenoid that releases gas, the flame sensor, and the gas supply. Electric dryers use a high-resistance heating element on a 240V circuit — failures include the element itself, the high-limit thermostat, and the 240V power supply. Both types share the thermal fuse and cycling thermostat as potential failure points. Diagnosis is different for each type.
Why does my dryer's thermal fuse keep blowing?
Thermal fuses blow due to overheating — and the #1 cause of overheating is restricted airflow from a clogged vent. Replacing the fuse without clearing the vent guarantees the fuse will blow again, typically within weeks. Any professional dryer technician should check vent airflow as part of diagnosing 'not heating' or 'thermal fuse blown' calls. We do.
How often should I clean my dryer vent?
Annual cleaning for households running 4+ loads per week. Every 6 months for households running 7+ loads per week (large family, work-from-home with frequent kitchen towel washing). LA's dry climate slightly accelerates accumulation. The vent run length also matters — longer or more-bent runs need more frequent cleaning.
Need an appliance fixed in Westside LA?
Call (213) 205-2055 or text a photo of your appliance.