Dryer Not Heating? The Most Common Causes Explained

Not just the lint screen. The whole path from the dryer outlet to the outside hood. Disconnect the dryer, pull the flex duct, clear any lint buildup along the rigid duct run, and confirm the outside hood flap opens freely.

In Palm Beach County, palmetto bugs, bird nests, and dryer sheets often block the outside hood. A clogged vent is the root cause of thermal fuse failure, which shows up as 'dryer not heating.' Replacing the fuse without clearing the vent guarantees repeat failure inside weeks.

A thermal fuse is a one-time safety device on the blower housing. If the dryer overheats (usually from restricted airflow), the fuse opens and the dryer loses heat but may still tumble. A blown fuse tells you two things: the fuse needs replacement, AND the vent needs cleaning.

Unplug the dryer, access the fuse (location varies by model — usually on the blower housing at the rear or bottom), and test for continuity with a multimeter. No continuity = blown, replace it.

Electric dryers use a coiled heating element at the back of the drum housing. Elements fail from age (coil breaks), from burning out against a restriction (see: vent problem), or from electrical surges.

Visual inspection: remove the element housing. A broken element usually shows visible damage — a broken coil loop or a burn spot. Test with a multimeter for continuity across the element terminals — a good element reads around 8–15 ohms. Infinite reading = broken.

Replacement runs $60–$150 parts, 30–60 minutes labor.

Gas dryers have an igniter (glows orange when heat is called), a flame sensor (signals gas flow), and two gas valve coils (open the valve for burner operation).

Igniter failure is most common: it cracks, oxidizes, or simply wears out. Visual check — run a heat cycle in a darkened laundry room and watch the burner assembly. No orange glow = failed igniter, replace it ($30–$60 part).

If the igniter glows but gas doesn't flow, the coils have failed. Replace both coils together — they share age and load.

Dryers use multiple thermostats: cycling thermostat (controls normal operation), high-limit thermostat (safety backup), and temperature sensors (thermistors on newer models). Any of these can fail open, causing no heat or intermittent heat.

Test each with a multimeter for continuity at room temperature (should show continuity). Any thermostat that shows open at room temperature has failed and needs replacement. Typical cost $20–$40 parts.

The last and most expensive suspect. A failed control board can prevent heat cycles from firing even when everything else works. Usually diagnosed by eliminating all other causes first.

Control boards run $150–$350 on most dryers. On units over 10 years old, replacement often makes more sense than repair — get an apples-to-apples comparison before proceeding.

Tempted to jump the thermal fuse to get the dryer working again? Don't. The fuse exists to prevent fires — the National Fire Protection Association ranks clothes dryers as the #1 source of laundry-room structure fires. The fuse is blowing for a reason; fixing the reason is the repair, not bypassing the fuse.

Also: never run a dryer with the exhaust vent disconnected or blocked. The carbon monoxide risk on gas dryers is real, and electric dryers will re-blow the thermal fuse within hours.