A thermal fuse is a safety device designed to protect your dryer from overheating. It is a one-time-use fuse that will blow if the dryer’s temperature gets too high, which can happen if the lint filter is clogged, the exhaust vent is blocked, or the heating element is malfunctioning. If your dryer is not heating, one of the first things you should check is the thermal fuse.
To check the thermal fuse, you will need a multimeter. Set the multimeter to the ohms setting and then touch the probes to the terminals of the thermal fuse. If the thermal fuse is blown, the multimeter will read infinity. If the thermal fuse is good, the multimeter will read a low resistance, typically around 0 ohms.