Dryer Runs But Won't Heat — Causes & Fixes

Why is my dryer running but not heating up?

A dryer that tumbles but won't heat is usually starved of airflow (clogged lint/vent), missing one leg of its 240V power (electric models), or has a blown thermal fuse. Most causes are cheap to fix; gas burner and 240V power issues are where you call a pro.

ℹ️ Reference only: For general reference only. This guide does not guarantee any result — every home is different. Verify against your local building codes and a licensed professional before acting, especially for electrical, gas, plumbing, structural, or roof work.

💵 DIY: vent cleaning $0-30 (brush kit); thermal fuse, thermostat, or heating element parts $10-60. Pro: appliance repair service call typically $90-180, with common repairs landing $150-400 total parts + labor. Professional vent cleaning runs $100-200. Gas valve/igniter repair often $150-350. ⏱ Lint screen and vent cleaning: 30-60 minutes. Breaker reset: 5 minutes. DIY part replacement (thermal fuse/element/thermostat): 1-2 hours including testing. Pro repair: usually a single 1-2 hour visit. ● Use caution

Safety: A clogged dryer vent is a leading cause of home fires — clean it regularly and never run a dryer without the lint screen. ALWAYS unplug an electric dryer (or shut off the gas and unplug) before opening the cabinet; never test components on a live machine. Gas work and 240V panel/outlet work carry real risk of fire, electric shock, and gas leaks — leave those to a licensed pro. If you smell gas, leave the house and call your gas utility from outside. A breaker that repeatedly trips signals a wiring or short fault that needs an electrician, not repeated resets.

Common causes

Clogged lint filter or blocked dryer vent duct — trapped heat trips the dryer's safety thermostat, so it tumbles but stops heating. This is the single most common cause and also a serious fire hazard. (most common)
Quick check: Pull the lint screen (is it caked?), then run the dryer and feel the exterior vent flap outside — weak or no airflow means a clog.
Electric dryer is getting only 120V instead of 240V — one of the two breakers (or one half of a double breaker) tripped, or a fuse blew. The motor and lights run on 120V, but heat needs the full 240V. (common)
Quick check: Drum spins and panel lights up but no heat? Check the panel: flip the dryer's double breaker fully OFF then back ON.
Blown thermal fuse — a one-time safety device that opens permanently after an overheat (almost always caused by an earlier vent clog). On many models a blown thermal fuse kills heat; on some it kills the whole machine. (common)
Quick check: Unplug, access the fuse on the blower/heat duct, and test for continuity with a multimeter — no continuity means blown.
Failed heating element (electric) — the coil burns out or sags and shorts. Common on older dryers. (common)
Quick check: Unplug and test the element terminals for continuity; an open (no continuity) element is dead.
Gas dryer: igniter or gas valve coils failed, or the gas supply is off — the burner never lights. (common)
Quick check: Confirm the gas shutoff behind the dryer is open and other gas appliances work; listen for the igniter glowing/clicking at cycle start.
Failed thermostat (cycling or high-limit) or a faulty timer/control board not calling for heat. (less common)
Quick check: After cheaper causes are ruled out, test thermostats for continuity at room temperature; suspect the control board last.

How to fix it

Empty the lint screen every load. Then clean the screen housing with a vacuum and a long lint brush.
Disconnect and clean the full vent run: unplug the dryer (or shut off the gas), pull it out, detach the duct, and vacuum/brush out lint from the duct, the wall stub, and the exterior hood. Replace any crushed or plastic flex duct with smooth rigid or semi-rigid metal duct.
Confirm the exterior vent flap opens freely with airflow and isn't blocked by a bird nest or lint mat.
Electric, no heat: at the breaker panel, switch the dryer's double-pole breaker fully OFF, then back ON to reset a half-tripped breaker. If it trips again, stop and call an electrician.
If you're comfortable and the machine is unplugged, test the thermal fuse, heating element, and thermostats for continuity with a multimeter. These are inexpensive parts (often $10-40) and are common DIY swaps on electric dryers.
Critical: if a thermal fuse blew, find and clear the airflow blockage that caused it before replacing the fuse — otherwise the new fuse will blow again and you've masked a fire risk.
Gas dryer: verify the gas supply valve behind the unit is open and other gas appliances work. Beyond that, leave igniter, gas valve coil, and burner work to a licensed appliance tech.
If the basics check out and you're not equipped to test components, call an appliance repair tech — bring the brand and model number (on the door jamb or inside the door).

DIY or call a pro?

DIY is fine for cleaning the lint screen and full vent run, resetting the breaker once, and — if you own a multimeter and are comfortable working inside an unplugged electric dryer — swapping a thermal fuse, heating element, or thermostat. Call a licensed pro for anything on a gas dryer's burner system (igniter, gas valve, gas leaks), for 240V power problems at the panel or outlet, or if a breaker keeps tripping. Also call a pro if you've cleaned the vent and reset power but still have no heat and don't want to open the cabinet.

Tools & parts

Vacuum with hose attachment
Long flexible dryer-vent lint brush
Multimeter (for continuity testing)
Nut driver / screwdriver set
Replacement thermal fuse, heating element, or thermostat (model-specific)
Rigid or semi-rigid metal dryer duct and clamps (if replacing flex duct)
Work gloves

Keep a record of every fix you make — what broke, what it cost, how you solved it.

Track your home's fixes in Home Story →

Based on: Manufacturer use-and-care and service guidance (Whirlpool, GE, LG, Samsung, Maytag); Reputable DIY repair references (This Old House, Family Handyman); NFPA / U.S. Fire Administration guidance on dryer lint and vent fire safety; National Electrical Code norms for 240V dryer circuits

General home-maintenance guidance, not a substitute for professional inspection. Always unplug the dryer and shut off the gas before servicing. Work on gas lines, burner components, and 240V electrical should be done by a licensed professional. If you smell gas or see scorching, stop and call a pro or your utility.