3977393 Dryer Thermal Fuse

3977393 Dryer Thermal Fuse

Key Features

• Safety component that shuts off the heating circuit when dryer temperatures become too high.
• Acts as a one-time, non-resettable fuse.
• Rated for 325 degrees Fahrenheit.
• Often packaged in a kit with a high-limit thermostat (such as part 3977767).

Replaces / Cross-Reference Part Numbers

• 3977393
• 3399848
• AP3094244

Compatibility & Fitment

• Designed for a wide range of electric clothes dryers.
• Fits many models from major brands including Whirlpool, Kenmore, Maytag, Roper, KitchenAid, and Crosley.

When to Replace

• Primary symptom is the dryer tumbling but producing no heat.
• The dryer may not start at all if the fuse is part of the main motor circuit.
• Replace when the original fuse shows no continuity when tested with a multimeter.
• It is critical to also resolve the underlying overheating issue, such as a clogged vent.

Installation Tips

• Disconnect the dryer from the electrical outlet before beginning any repair work.
• The fuse is typically located on the heater box or blower wheel housing.
• Verify the existing fuse has failed by testing for continuity; a reading of infinity or "OL" confirms it is blown.
• Before installing the new fuse, thoroughly clean the lint trap, exhaust hose, and external vent to ensure proper airflow and prevent repeat failure.