Dryer Not Heating: Causes and Fixes

A dryer that tumbles but stays cold is frustrating, but the fix is often simple. The most common causes are a tripped circuit breaker, a clogged vent that overheated the machine, and a blown thermal fuse. Start with the fastest checks: make sure the breaker is fully on, clean the lint filter, and go outside to check that the vent hood flap opens freely while the dryer runs. If the drum turns but the air stays cold, work through the checks below, starting with the easiest ones.

Check the Circuit Breaker (Electric Dryers)

An electric dryer needs 240 volts to heat but only 120 volts to tumble. A half-tripped breaker gives you a spinning drum with zero heat, which confuses a lot of people.

• Breaker tripped on one leg — Go to your breaker panel and find the double breaker labeled for the dryer. Push it fully to OFF, then firmly back to ON. A breaker that looks on can still be tripped halfway, so the full off-on cycle matters.
• Breaker trips again immediately — If it trips again as soon as the dryer heats, stop and call an electrician or technician. Repeated tripping means a short or an overloaded circuit, not a breaker problem.
• Loose or damaged outlet — With the breaker off, check that the dryer's plug sits firmly in the outlet. A loose, scorched, or melted outlet is a fire hazard and needs an electrician.
• Wrong power after a move — If the dryer just moved to a new home, confirm the outlet actually supplies 240 volts. Some laundry areas only have a standard 120-volt outlet, which runs the drum but never the heater.

Check the Gas Supply (Gas Dryers)

A gas dryer heats with a burner, so no gas means no heat. The drum still tumbles on regular household electricity.

• Gas valve shut off — Find the gas shutoff valve on the wall or floor behind the dryer and make sure the handle runs parallel to the gas line, which means open. Valves get bumped closed during cleaning or moves.
• Other gas appliances dead too — If the stove and water heater also have no gas, the problem is the household supply or a billing shutoff, not the dryer. Contact your gas utility.
• Kinked flexible gas line — If the dryer was pushed back too hard, the flexible connector can kink. Do not force it straight yourself if you are unsure; a damaged gas line is a job for a professional.
• Smell gas at any point — Stop what you are doing. Do not flip switches or unplug anything. Leave the house and call your gas company or emergency line from outside.

Clean the Lint Filter and Check Airflow

Dryers heat by blowing hot air through tumbling clothes. Restricted airflow makes the machine overheat, trip its safety devices, and dry poorly even when the heater works.

• Clogged lint filter — Pull the lint screen out and clean it before every single load. Once a month, wash the screen with warm soapy water and a soft brush, because fabric softener residue forms an invisible film that blocks airflow even when the screen looks clean.
• Lint packed around the filter housing — With the filter out, vacuum inside the slot to remove the lint that falls past the screen.
• Overloaded drum — A drum stuffed too full cannot tumble clothes through the hot air. Dry large loads in two batches.
• Wrong cycle — Air Fluff, Air Dry, and wrinkle-release settings tumble with no heat on purpose. Make sure you selected a heated cycle like Normal or Timed Dry.

Inspect the Exhaust Vent

A blocked vent is the number one reason dryers overheat and blow their thermal fuse. It is also a genuine fire risk, so take this check seriously.

• Outside vent hood blocked — While the dryer runs, go outside and check the vent hood. You should feel strong warm airflow and see the flap open. No airflow means a blockage somewhere in the duct.
• Crushed or kinked transition hose — The short hose behind the dryer crushes easily when the machine is pushed back. Pull the dryer out and make sure the hose is round and smooth, not flattened.
• Lint packed in the duct — Disconnect the duct from the back of the dryer with the machine unplugged and vacuum out the lint. Long duct runs with bends collect the most lint.
• Wrong duct material — The vent should be rigid or semi-rigid metal duct. Flexible plastic or foil accordion duct crushes, traps lint, and is not safe for dryers. Replace it with metal duct.
• Vent too long — Very long duct runs with multiple bends choke airflow. Keep the run as short and straight as possible, and clean it at least once a year.

Understand the Thermal Fuse

The thermal fuse is a one-time safety device. When the dryer overheats, it blows and permanently cuts power to the heating system. The dryer will tumble but never heat again until the fuse is replaced.

• Why it blows — Almost always restricted airflow: a clogged vent, a packed lint filter, or a crushed hose. The fuse did its job by preventing a fire.
• Replacing the fuse alone is not the fix — A new fuse will blow again within days if the vent is still blocked. Clear the entire vent path first, then have the fuse replaced.
• Where it lives — On most models it sits on the blower housing or near the heating element inside the cabinet. Reaching it means opening the dryer, which is technician work for most homeowners.
• Signs it has blown — The dryer tumbles normally, the breaker is fine, the vent is now clear, and there is still zero heat. A technician confirms it with a continuity test.

Heating Element Failure (Electric Dryers)

The heating element is a coil of wire that glows hot as air passes over it. After years of heating and cooling cycles, the coil can break.

• Broken coil — A visible break or blister in the coil means no heat. Sometimes the break only opens when the coil gets hot, which causes the intermittent heating some people see.
• Coil touching the housing — A sagging coil that touches metal can short, trip the breaker, or heat unevenly. This needs professional attention.
• Thermostat failures — The cycling thermostat and high-limit thermostat control when the element turns on and off. A failed thermostat can keep the element off permanently. These are tested and replaced by a technician.
• What you can observe safely — If the dryer heats on some cycles but not others, or the heat fades partway through a load, note the pattern. That detail helps the technician diagnose it fast.

Igniter and Gas Valve Problems (Gas Dryers)

A gas dryer lights its burner with an electric igniter. The most common gas no-heat failure is an igniter that glows but is too weak to open the gas valve.

• Weak igniter — You may see the igniter glow orange through the inspection window but hear no whoosh of the burner lighting. An igniter can glow and still be too weak to work, which is why visual checks alone mislead.
• Failed gas valve coils — The electric coils that open the gas valve wear out, often working for the first cycle of the day and failing as they warm up. Heat that works for one load then disappears points here.
• Flame sensor failure — If the sensor does not detect the flame, the control shuts the gas off as a safety measure.
• Gas parts are not DIY — Anything involving the gas valve, burner, or gas line connections should be handled by a qualified technician. Never bypass a safety device to test a theory.

Timer, Control Board, and Moisture Sensor Issues

When the power, vent, fuse, and heater all check out, the electronics that decide when to heat may be at fault.

• Timer not advancing heat calls — On older dryers with a mechanical timer, worn contacts can stop sending power to the heater while the motor keeps running. If the timer knob does not advance during the cycle, suspect the timer or timer motor.
• Control board failure — Electronic boards can lose the heater relay while everything else works. A board that shows error codes, behaves erratically, or went through a power surge is suspect.
• Moisture sensor bars coated — On sensor-dry cycles, two metal bars inside the drum sense wetness. Fabric softener residue coats them and tricks the dryer into thinking clothes are dry, so it ends the heat early. Wipe the bars with a damp cloth and try a timed cycle instead.
• Reset the electronics — Unplug the dryer or switch its breaker off for five minutes, then restore power. This clears temporary control glitches on electronic models.