Dryer Not Heating? What to Check First

In this guide

Safety First

Lint is fuel. Fire safety groups such as NFPA point to lint buildup as a leading cause of dryer fires. So take a no-heat problem seriously, and do not keep running a dryer that smells like burning. If you have a gas dryer and smell gas, leave the home and call your gas utility and 911 first.

Is Your Dryer Gas or Electric?

Electric dryers use a large 240-volt plug and a thick cord. Gas dryers have a normal plug and a gas line behind the machine. This matters, because the parts that make heat are different.

Quick Checks to Try

1. Clean the Lint Screen and Housing

A clogged screen cuts airflow, so the dryer overheats and shuts off its heat to protect itself. Pull out the screen, clear the lint and look into the slot. Once in a while, wash the screen with warm soapy water. Fabric softener sheets can leave a film that blocks airflow.

2. Check the Cycle and Heat Setting

Make sure you did not choose an air-only or low-heat cycle. Some delicate settings give very little heat. Try a regular timed dry for ten minutes and feel the air at the vent.

3. Look at the Load

A huge or very wet load can take a long time. Wring out heavy items first. Try a small load of towels to see if the dryer heats.

4. Check the Vent and Outside Flap

Pull the dryer out and look at the duct behind it. A crushed or kinked duct holds back hot air. Go outside and watch the flap while the dryer runs. If it barely moves, the vent may be clogged. Read about vent cleaning for dryers.

5. Check the Breaker (Electric Dryers)

An electric dryer uses two power lines. If one half of the double breaker trips, the drum can still turn but the heater gets no power. Switch the breaker fully off and then on. If it trips again, stop, and call us.

6. Check the Gas Valve (Gas Dryers)

Make sure the gas shut-off valve is open. The handle is usually in line with the pipe when it is open. If you smell gas at any time, do not try to fix it yourself.

Parts That Commonly Fail

Electric dryers

• The heating element, a long coil that makes heat.
• The thermal fuse, which blows when the dryer overheats.
• The thermostat or high-limit switch.
• The terminal block or power cord.

See electric dryer service for details.

Gas dryers

• The igniter, which glows to light the gas.
• The gas valve coils, which open the valve.
• The flame sensor, which watches the flame.
• The thermal fuse, which blows when the vent is blocked.

See gas dryer repair for details.

No Heat vs Slow Drying

These are different problems. No heat means the air stays cool and the dryer never warms up. Slow drying means it warms up but takes two or three cycles. Slow drying is usually a clogged vent. No heat is usually a failed part. Both need attention, and they can be related, since a clogged vent can blow the thermal fuse.

A Simple Airflow Test

Run the dryer on a timed dry. Go outside and hold your hand near the vent hood. You should feel a strong stream of warm air. If the air is weak or cool, the problem is the vent or the heat source. If the air is strong but cool, the heat source is the likely issue.

How to Prevent Dryer Problems

• Clean the lint screen after every load.
• Have the vent cleaned about once a year.
• Do not overload the drum.
• Use rigid or smooth metal duct, which moves air better than thin foil.
• Keep the vent run short with few bends.
• Keep the area around the dryer clear.

When Replacing Makes Sense

Dryers often last about 10 to 13 years. If yours is much older and has several faults, replacing it may be smarter. If it is newer and the problem is a single part, repair is usually a good value. Learn more in our guide to repair or replace. Our dryer fixes team will give you an honest view.

A Closer Look at the Vent System

Your vent is the road hot, wet air takes to leave your home. If the road is blocked, the dryer cannot do its job. To check it, unplug the dryer, pull it away from the wall and disconnect the duct. Look inside for packed lint. Then check the whole path to the outside wall.

• Is the duct crushed or kinked?
• Is the duct made of thin foil or plastic? Smooth metal duct is better.
• Does the run have many bends or a very long length?
• Is the outside flap stuck, covered or blocked by a nest?

A short, straight path works best. If yours is long, it may need more frequent cleaning.

Why Thermal Fuses Blow

A thermal fuse is a small safety part. It cuts power to the heater when the dryer gets too hot. The fuse is cheap, but it blows for a reason, and the reason is usually poor airflow. If you replace the fuse and do not fix the vent, the new fuse can blow again. That is why we always check the vent when we repair a no-heat dryer.

Common Mistakes to Avoid

• Running the dryer again and again, hoping it will start heating.
• Taking the back off a dryer while it is plugged in.
• Using a vacuum hose on the vent but not cleaning the outside hood.
• Ignoring a burning smell.

What to Tell Us When You Call

• Gas or electric.
• What happens when you start a cycle.
• Whether the air is cool or just weak.
• When you last cleaned the vent.
• The brand and the model number.

With those details, we can plan the repair and bring the right parts. See our washer troubleshooting guide too.

Winter Notes for Chicago-Area Homes

Cold, snowy months bring special dryer problems. Snow or ice can block the outside vent flap, so check it after storms. Long vent runs through cold basements or crawl spaces can collect moisture and lint, which makes drying slower. Dryers also work harder in cold rooms. If your laundry room is in an unheated area, expect longer cycles and clean the vent more often.

How Long Should a Dryer Cycle Take?

Most normal loads dry in about 45 to 60 minutes. If your dryer needs much more than that, or needs two full cycles, something is wrong. Start with the lint screen and vent, then think about the heat source.

When to Call Us Right Away

• You smell something burning.
• The outside of the dryer feels very hot.
• The breaker keeps tripping.
• You smell gas.

For these, stop using the dryer and call (708) 840-0993 or read our same-day service page.

One Last Tip

Write down what you tried and what you saw. If you call us, tell us whether the air at the outside vent was strong, weak, warm or cold. That one detail often saves a technician time and helps us bring the right part on the first visit.

Questions

FAQs