To replace a thermal fuse unplug the dryer, remove the exhaust hose, remove the dryer's back panel, disconnect the wires and screws holding the old fuse in place, and then install the new fuse. Screw the fuse into place, connect the appropriate wires, and reassemble the dryer.
To install the fuse, disconnect the exhaust hose from the wall vent, unplug the power cord, and remove the dryer's back panel according to the instructions in the owner's manual. The thermal fuse is a small white device that is typically located on the exhaust duct inside the back of the dryer. Remove the wires connecting the thermal fuse to the thermostat, and remove the screw that holds the thermal fuse in place using a hex wrench.
Replace the hex screw after setting the new thermal fuse in place, and tighten the screw to secure the fuse. The two sets of wires do not need to be in their original position for the dryer to operate, but they must be connected securely to the terminals on the thermal fuse before starting the dryer. After connecting the wires, reconnect the exhaust hose to the outdoor vent, plug the dryer into an outlet and turn the dryer on to test the dryer for proper operation.