Why Is My Dryer Not Heating Up?
QUICK ANSWER
Check the lint trap and vent for clogs (overheating from clogs trips the thermal fuse, killing the heat). Test the thermal fuse with a multimeter (cheap part, common failure). For gas dryers, verify the gas supply is on. Inspect the heating element for visible breaks (electric).
A dryer that runs but doesn't heat is one of the most common dryer problems and usually has a relatively simple cause. The most frequent culprit is a blown thermal fuse, often triggered by lint buildup that caused the dryer to overheat. Gas dryers have additional possible causes related to the gas supply or igniter. Here is the diagnostic order for both electric and gas dryers plus when professional repair makes sense.
How do you start the diagnosis?
First identify electric vs. gas dryer. Look at the power cord and connections: electric dryers have a thick 4-prong (or older 3-prong) cord plugging into a 240V outlet; gas dryers have a standard 120V cord plus a gas line connection. Listen during operation: if the dryer runs (drum tumbles) but doesn't produce heat, the issue is with the heating system, not the motor. If nothing happens at all, the issue is electrical (different troubleshooting). Common causes by frequency: 1) Blown thermal fuse (very common, usually caused by clogged vent); 2) Failed heating element (electric) or igniter (gas); 3) Failed thermostat or thermistor; 4) Gas supply issue (gas dryers only); 5) Failed control board (less common, more expensive).
Have you checked the lint and vent?
Clogged vents cause the thermal fuse to blow; replacing the fuse without fixing airflow just blows the new fuse. Clean the lint trap thoroughly. Clean the full vent from dryer to outside. Verify the outdoor vent flap opens during operation. Remove the dryer back panel and check for lint buildup near the heating element; this is a fire risk and overheating cause. Most thermal fuse failures trace back to restricted airflow from lint buildup. Once airflow is restored, the new fuse lasts.
How do you check the thermal fuse?
The thermal fuse is a safety device that blows when temperature exceeds limits; must be replaced if blown. Unplug (electric) or turn off gas. Remove the back access panel. Locate the fuse on the blower housing or near the heating element; small cylindrical or rectangular with two wires. Test with a multimeter for continuity; should beep if good; no continuity means blown. Replacement fuses cost 10 to 25 dollars. Install in the same position; reconnect wires; reassemble; test.
What if it's not the fuse?
Other causes. Failed heating element (electric): visible coil of wire inside a metal housing; test with multimeter for continuity. Replacement: 30 to 75 dollars; DIY with intermediate skills. Failed igniter (gas): test with multimeter; 30 to 80 dollars to replace. Failed thermostat or thermistor: 20 to 80 dollars. Failed gas valve (gas dryers): 100 to 200 dollars. Failed control board: 300 to 500 dollars. For older dryers (over 10 years) with major failures, replacement often makes sense.
Dryers not heating usually trace back to a clogged vent that caused the thermal fuse to blow as a safety response. Addressing both the clog AND the blown fuse fixes the problem permanently. For other causes (failed heating element, igniter, thermostat), the diagnostic order from cheapest to most expensive: thermal fuse, then heating element/igniter, then thermostat. Most repairs are DIY-friendly with basic tools and a multimeter. For older dryers with major failures or complex multiple-cause problems, replacement often makes more sense than repair.
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