A dryer that runs very hot, smells scorched, or shuts off partway through a cycle is telling you air isn't moving. Most of the time it's the vent. Below are the five causes we find on Twin Cities service calls, in order, and what each costs to fix.
Reviewed by Mike Larson, Master Appliance Technician · 18+ yrs in-field · Last reviewed
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Quick answer
Stop using the dryer and check the vent first: clean the lint filter, then feel for strong airflow at the outside vent hood. A clogged vent causes most overheating and is the leading cause of dryer fires. If airflow is good, the likely parts are the cycling thermostat ($185–$285), a cracked blower wheel ($245–$345), or a shorted heating element ($265–$385). Flat $149 trip fee credited on approval. 1-year written warranty.
Root causes, ranked by what we find
What it is: Lint builds up in long vent runs, and foil ducts get crushed behind the dryer. With no airflow, heat builds until the safety thermostat shuts the dryer off. Signs: the top of the dryer is hot to the touch, clothes smell scorched, and loads take two cycles.
Fix: Clean the full vent run, replace crushed foil duct with rigid or semi-rigid metal, and test the thermostats.
Typical all-in: $185–$265 all-in
What it is: This thermostat switches the heat on and off to hold temperature. When it sticks closed, the heat never cycles off and the high-limit trips.
Fix: Test and replace the cycling thermostat, and replace the high-limit at the same time.
Typical all-in: $185–$285 all-in
What it is: The blower wheel pushes hot air out the vent. When its hub cracks, it spins without moving air, so the dryer overheats even with a clean vent. Often comes with a rattle.
Fix: Replace the blower wheel and clean lint from the blower housing.
Typical all-in: $245–$345 all-in
What it is: A coil touching the heater housing can keep heating even when the controls say off. The dryer gets hot even on air-fluff, and may trip the breaker.
Fix: Replace the heating element and both thermostats; check wiring for heat damage.
Typical all-in: $265–$385 all-in
What it is: On Samsung, LG, and newer Whirlpool dryers, a bad temperature sensor reads low, so the board keeps heating. Often shows an error code.
Fix: Test the thermistor against its spec; replace it, or the board if the thermistor tests good.
Typical all-in: $205–$525 all-in
Diagnostic order
Pull the filter and vacuum the slot underneath. A packed slot alone can cause overheating.
Pull the dryer out a few inches. Look for crushed or kinked foil duct.
With the dryer running, you should feel strong, warm air at the hood outside. Weak air means the vent is clogged.
If the dryer gets hot with no heat selected, stop — that points to a shorted element.
If it still runs hot, don't keep using it. Most fixes are $185–$385 all-in.
FAQs
Most often the vent is clogged, so the dryer overheats and a safety thermostat shuts it off. A failed cycling thermostat, cracked blower wheel, or bad thermistor are the next most common causes.
Yes. Clogged vents are the leading cause of home dryer fires. Stop using it until the vent is cleared and the thermostats are tested.
Usually $185–$385 all-in. Vent cleaning with a thermostat test is $185–$265; a blower wheel $245–$345; a heating element $265–$385. The $149 trip fee is credited on approval.
Hot air can't escape, usually because of a clogged vent or a crushed duct behind the dryer.
You can clean the lint filter, straighten the duct, and clear the outside hood. Testing thermostats and replacing parts is best left to a technician.
Related coverage
What will this cost?
Trying to decide repair vs. replace? These pages break down real all-in pricing by brand, model class, and failure mode — so you know the number before we knock.
