Customer Questions and Answers for Thermal Fuse (Disposable, One Time Fuse) by Whirlpool

Hello Tammie, This sounds like the thermal fuse WP3392519. No one like to hear this, but the exhaust needs to be checked for crimps or clogs. You see, the thermal fuse is opened by temperature, so if you just replace it, it will fail again rather quickly. The exhaust needs to be checked to make sure there is sufficient air flow to get the heat, lint, and moisture out of the unit. The dryer drum rides on felt seals, so if there is too much back pressure built up from the ducting, it is too easy for the pressure to blow past the felt seals, and this puts the heat back into the cabinet with the thermal fuse. This will blow it again. There is a test kit to determine if the air flow in you ducting system is sufficient. The part number is W11224254 and it's called a dryer vent test kit.