Whirlpool Dryer Thermal Cut-Off Fuse Parts — Models & Compatibility

Your Whirlpool dryer just stopped heating mid-load, or worse — it won't start at all. Before you call a repair tech charging $150 just to show up, you're probably looking at a blown thermal cut-off fuse. This safety component is designed to fail when your dryer overheats, protecting your home from fire. The 3977393 thermal fuse kit works across 200+ Whirlpool, Kenmore, Maytag, KitchenAid, and Roper dryer models.

Is This the Right Part for Your Model?

Check your dryer's model number plate — it's usually inside the door opening or on the back panel near the top. Match your full model number (including letters and numbers) against the compatibility list below. This thermal fuse fits electric dryers from multiple series including LER, WED, 3DWED, and 3HLER models. If your model starts with 110 (Kenmore), check the first few digits against common compatible prefixes like 11066, 11067, or 11068.

About This Replacement Part

The thermal cut-off fuse is a one-time-use safety device mounted on your dryer's heating element housing or blower wheel. When airflow gets restricted (lint buildup, clogged vent, bad blower wheel), temperatures spike and the fuse blows at around 250°F. Once it fails, it can't be reset — you've got to replace it. This kit includes the thermal fuse plus mounting hardware. Common symptoms of a blown fuse include the dryer tumbling but producing zero heat, the dryer refusing to start entirely, or heat that stays on even after the drum stops (indicating a different electrical fault). One frustrated owner mentioned spending money on a heating element when the real culprit was this $47 fuse — don't make that mistake. Always test the thermal fuse first with a multimeter before replacing expensive heating elements.

Why Thermal Fuses Fail

Thermal fuses don't just blow randomly. The most common cause is restricted airflow — your dryer vent hose is kinked, crushed behind the dryer, or packed with years of lint buildup. Even if you clean the lint screen after every load, lint escapes into the vent system and gradually chokes off airflow. Other causes include a worn blower wheel (can't move enough air), a bad cycling thermostat (allows temps to climb too high), or a failed heating element that's stuck on. Before you button everything back up after replacing this fuse, pull your vent hose off and inspect it. If it's full of lint, clean it out or you'll be buying another fuse in six months.

Compatible Model Series

This thermal fuse works across several Whirlpool Corporation brand families. The LER series (Whirlpool electric dryers) from the mid-2000s through 2010s use this fuse extensively. Kenmore 110-series dryers manufactured by Whirlpool during the same period are compatible. Maytag models absorbed into Whirlpool after 2006 also use this part. KitchenAid and Roper dryers built on the same platform share the same thermal protection components. Check the full model list below — if you've got a Whirlpool-family dryer from roughly 2003-2015, there's a strong chance this is your part.

Installation Considerations

Replacing the thermal fuse isn't complicated, but it does require unplugging the dryer and accessing the heating element assembly. On most models, you'll remove the lower front panel or the rear panel to reach the blower housing where the fuse mounts. The fuse has two wire terminals — take a photo before disconnecting so you remember which wire goes where. Use a multimeter to test the old fuse (should read zero ohms if good, infinite ohms if blown). While you're in there, inspect the heating element coils for breaks or shorts and check the blower wheel for lint buildup or cracks. If the blower wheel looks damaged, replace it at the same time or your new fuse won't last.

Replaces These Part Numbers

If you're cross-referencing part numbers from other sources, this thermal fuse kit replaces AP3094244, 3399848, 279816, PS334299, and WP3977393. Parts suppliers sometimes list these numbers separately, but they're all the same component. Whirlpool redesignated this part several times over the years, which is why you'll see multiple numbers floating around. As long as your model number appears in the compatibility list, any of these part numbers will work.