Dryer Not Heating Up? 5 Common Causes You Can Fix Yourself

You start the dryer, you hear it tumble for an hour, but the clothes come out cold and damp. Or worse, the cycle ends and the drum is barely warm. Frustrating, but rarely catastrophic. A dryer that tumbles fine but produces no heat is one of the most predictable appliance problems and the cause is almost always one of five things. Three of them are free to fix, two cost under $50 in parts.

Before you start pulling panels, check whether you have a gas dryer or an electric dryer. The two have different failure modes. Gas dryers can fail at the igniter, the gas valve, or the flame sensor in addition to the issues below. Electric dryers fail at the heating element, fuses, or thermostats. The diagnostic steps below cover both, with notes where they differ.

Start With These 30-Second Checks

1. 1Check the cycle setting - some dryers have an Air Fluff or No Heat option that runs cold by design.
2. 2Empty the lint screen completely - a packed lint screen blocks airflow and trips the safety thermostat.
3. 3Open the dryer door and feel inside the drum 5 minutes into a hot cycle - if the drum walls are warm, the heating system works but airflow is the issue.
4. 4Electric dryers: confirm both 240V breakers are on. Some homes have two separate 120V breakers feeding one dryer outlet, and one tripped means tumble works but heat does not.

1. Lint Screen and Vent Path Clogged

The most common cause and the most dangerous one if ignored. When airflow is blocked, the dryer overheats, the safety thermostat opens to protect the unit, and the heat shuts off. Worse, blocked vents are the leading cause of dryer fires.

1. 1Pull out the lint screen and look at it - a clean screen lets a quarter pass through it. If lint is matted in the mesh, scrub it with hot soapy water and a brush.
2. 2Look down into the lint trap housing with a flashlight - vacuum out any lint that fell past the screen.
3. 3Disconnect the vent hose from the back of the dryer and shake it out - you will be amazed at how much lint hides in there.
4. 4Check the outside vent hood - the flap should open easily when the dryer runs. Bird nests, leaves, or accumulated lint can block it.
5. 5If the vent run is over 25 feet or has multiple bends, get a vent brush kit ($20) and snake the entire run.

2. Thermal Fuse Blown

When the lint vent clogs and the dryer overheats, a one-time thermal fuse blows to shut off heat. Even after you clean the vent, the fuse stays blown and the dryer keeps running cold. This is the second most common no-heat cause.

1. 1Unplug the dryer (or shut off the gas valve and unplug for gas dryers).
2. 2Pull the dryer out and remove the rear access panel - usually 4 to 6 screws.
3. 3Locate the thermal fuse on the blower housing or near the heating element - it is a small white or black rectangular component.
4. 4Test with a multimeter set to continuity. No continuity equals blown.
5. 5Replacement is $5 to $15 and takes 15 minutes. CRITICAL: clean the vent path BEFORE replacing the fuse, or it will blow again.

3. Heating Element Burned Out (Electric Dryers)

The heating element is a coil of wire that glows red-hot when current flows through it. After 8 to 12 years it breaks, the circuit opens, and the dryer runs without producing heat. This is the third most common cause and applies only to electric dryers.

1. 1Unplug the dryer and remove the rear access panel.
2. 2Locate the heating element housing - a metal box about the size of a shoebox, usually with a coil visible through the vents.
3. 3Disconnect both wires going to the element terminals.
4. 4Test continuity across the two terminals with a multimeter. No continuity means broken element.
5. 5Replacement element is $30 to $80, takes 45 minutes including reassembly.

4. Gas Igniter Failed (Gas Dryers Only)

Gas dryers use a small igniter that glows hot, then opens the gas valve when it reaches temperature. Igniters fail with age - the dryer tumbles, you hear the gas valve click, but no flame ever lights.

1. 1Shut off the gas valve at the wall and unplug the dryer.
2. 2Remove the front or bottom access panel to expose the burner assembly.
3. 3Watch the igniter at the start of a cycle - it should glow bright orange within 30 seconds.
4. 4If it does not glow at all, the igniter is dead. Test with a multimeter for continuity if you want to confirm.
5. 5Replacement igniter is $20 to $40 and takes 30 minutes. Handle the new one with gloves - oils from your skin shorten the life.

5. Cycling Thermostat or High-Limit Thermostat Failure

Dryers have two thermostats: the cycling thermostat that controls the normal heat range, and the high-limit thermostat that shuts everything off in an overheat. Either failing causes the same no-heat symptom.

1. 1Locate both thermostats on the heating element housing or blower wheel housing - they are small round metal discs with two wires.
2. 2Test each one with a multimeter for continuity at room temperature - both should read continuous.
3. 3If either reads open at room temperature, replace it ($10 to $20 each).
4. 4Replace both at the same time if your dryer is over 8 years old - the second one is usually about to fail anyway and the labor is identical.

Tools You Will Probably Need