dryer

Dryer Overheating and shutting off

If your dryer is overheating and shutting off mid-cycle, the most likely cause is restricted airflow due to a clogged lint trap, blocked exhaust vent, or a failed thermal fuse. This guide walks you through inspecting and fixing each of these issues step by step, starting with the simplest fixes and working toward more involved ones.

1. 1

   Unplug the Dryer and Prepare Your Work Area

   Before doing anything else, unplug the dryer from the wall outlet. If you have a gas dryer, also turn off the gas supply valve behind the unit. Pull the dryer away from the wall so you have room to work. Make sure the area is well lit. Wait at least 15 minutes before touching any internal parts, as components inside can stay hot for a while after the dryer shuts off.

   warning

   Never work on a dryer that is still plugged in. Electric dryers run on 240 volts, which can cause serious injury or death.

   warning

   If you smell gas at any point, leave the area immediately, do not use any electrical switches, and call your gas company.

   tip

   Take a photo of the back of the dryer, including how the exhaust duct connects, before you move anything. This helps when reassembling.

2. 2

   Clean the Lint Trap and Its Housing

   Remove the lint screen from its slot, usually located inside the door opening or on top of the dryer. Peel off any built-up lint by hand, then wash the screen with warm soapy water and a soft brush to remove fabric softener residue that can block airflow even when the screen looks clean. Let it dry completely before reinstalling. Next, use a long, flexible lint brush or vacuum attachment to clean inside the lint trap housing — the slot where the screen sits. Lint builds up deep in this channel over time and can cause overheating.

   tip

   Hold the clean lint screen up to a light. If water doesn't pass through it easily during washing, the mesh is coated and blocking airflow even when lint-free.

   tip

   Lint trap cleaning kits with long flexible brushes are inexpensive and make this job much easier.

3. 3

   Inspect and Clear the Exhaust Vent Duct

   Go to the back of the dryer and disconnect the exhaust duct from the dryer's exhaust port. This duct is usually held on with a clamp or just friction-fit. Look inside both the duct and the dryer's exhaust port with a flashlight. Remove any lint clogs by hand or with a vacuum. Then go outside and locate where the vent exits your home — it should have a flap or louvered cover. Check that the cover opens freely and is not blocked by lint, a bird nest, or debris. Run a long dryer vent cleaning brush through the entire duct from the outside if possible. Reattach the duct securely when done.

   warning

   Do not use a plastic or foil accordion-style duct if you currently have one. These trap lint and are a fire hazard. Replace with rigid or semi-rigid metal duct.

   tip

   The exhaust duct should be as short and straight as possible. Each 90-degree bend reduces airflow significantly.

   warning

   A clogged exhaust vent is one of the leading causes of house fires. Do not skip this step even if the vent looks okay from the outside.

4. 4

   Run a Test Cycle to Check Airflow

   Plug the dryer back in and run it on a timed heat cycle for about 5 minutes. Go outside to the exhaust vent opening and hold your hand near it. You should feel a strong, steady stream of warm air. If the airflow is weak or you feel almost nothing, there is still a blockage somewhere in the duct system. A weak airflow is a strong indicator of why your dryer is overheating. Unplug the dryer again before doing any further work.

   tip

   If you cannot feel air from the outside vent at all, check whether the duct has separated from a joint somewhere inside a wall or crawl space.

5. 5

   Locate and Test the Thermal Fuse

   If airflow is good but the dryer still overheats and shuts off, the thermal fuse is the next component to check. The thermal fuse is a one-time safety device that blows when the dryer gets too hot, cutting power to the heating element or the whole unit. To access it, unplug the dryer first, then remove the back panel of the dryer by unscrewing the screws around its edges. The thermal fuse is a small, oval or rectangular component mounted on the exhaust duct inside the dryer or on the heating element housing. It will have two wires connected to it. Disconnect the wires and use a multimeter set to continuity mode (the setting that beeps) to test the fuse. Touch one probe to each terminal on the fuse. A working fuse will cause the multimeter to beep. No beep means the fuse has blown and needs to be replaced.

   warning

   The dryer must be unplugged before you remove the back panel or touch any internal components.

   tip

   Look up your dryer's model number (usually on a sticker inside the door frame) before ordering a replacement thermal fuse to make sure you get the correct part.

   part

   You will need a thermal fuse that matches your dryer's make and model, and a basic multimeter to test it.

6. 6

   Replace the Thermal Fuse if Blown

   If your multimeter confirmed the thermal fuse is blown, you need to replace it. Order the correct replacement fuse for your dryer's model number. Once you have it, unplug the dryer and remove the back panel again if needed. Disconnect the two wires from the old fuse — they usually slide off as spade connectors. Remove the one or two screws holding the fuse in place and take it out. Mount the new fuse in the same position, secure the screws, and reconnect the wires. Important: a blown thermal fuse is always caused by overheating. If you replace the fuse without fixing the root cause (such as a clogged vent), the new fuse will blow again quickly.

   warning

   Always address the underlying cause of overheating before or at the same time as replacing the thermal fuse, or you risk the problem recurring immediately.

   tip

   While the back panel is off, take a moment to vacuum out any dust or lint that has built up inside the dryer cabinet.

7. 7

   Inspect the Cycling Thermostat

   If the dryer still shuts off after replacing the thermal fuse and clearing vent blockages, the cycling thermostat may be faulty. This thermostat regulates the operating temperature during the drying cycle. It is typically located near the heating element or on the exhaust duct inside the cabinet. With the dryer unplugged and back panel removed, disconnect the wires from the thermostat and test it with your multimeter on continuity mode. At room temperature, a working cycling thermostat should show continuity (beep). If it does not, it has failed and needs to be replaced using the same process as the thermal fuse replacement.

   tip

   The cycling thermostat looks very similar to the thermal fuse. Check your dryer's wiring diagram (often found inside the door or back panel) to identify the correct component.

   part

   A cycling thermostat matched to your dryer's model number is needed if the test shows no continuity.

8. 8

   Reassemble the Dryer and Run a Full Test

   Once you have completed your repairs, reattach the back panel and secure all screws. Reconnect the exhaust duct and make sure it is snug and not kinked or crushed. Slide the dryer back toward the wall, leaving at least 4 inches of clearance behind it so the duct is not compressed. Plug the dryer back in (and turn the gas valve back on if applicable). Run a full load of damp laundry on a normal cycle and stay nearby for the first cycle. The dryer should run completely through without shutting off early, and you should feel strong, warm airflow from the outside vent throughout the cycle.

   tip

   Check the outside vent cover periodically — at least once or twice a year — to make sure it stays clear of lint and debris.

   warning

   If the dryer shuts off again, still smells like burning, or makes unusual noises, stop using it and consult a professional technician. Do not continue using an unsafe appliance.