How to Troubleshoot & Replace Whirlpool AP6008360 / WP3398128 Thermostat

I checked the continuity on the thermal fuse (which was blown) and knew that it needed to be replaced. This made me question why it blew (i.e. what caused it to fail). I checked continuity on the thermostat (high limit) as well as the thermostat for the element. Both passed a continuity test, so I removed the high limit thermostat to inspect it and could hear it rattling inside. This leads me to believe the spring inside had failed, so I replaced this thermostat as well. Put it back together and it is working like new. 

The thermal cutoff went bad because of lint being trapped in dryer vent and blocked air-flow from dryer. Removed accumilation of lint and installed new thermal -cutoff and thermostat and dryer now works great. 

Diagnosed the fusible link was out. Decided while I was fixing that to take care of the thermostat and element. Took about 5 minutes and little money now its working like brand new. Dollar saved is a dollar earned 

1. Diagnostic showed failed thermal fuse. Other components had continuity. Ordered fuse that took 13 days to arrive. Replaced fuse. Fuse blew again on first load. 2. Next order fortunately came within 3 days. Replaced thermal fuse and heating element (even though element looked perfect with no scorch marks indicating grounding). So far, 5 loads successfully dried. 

Tested all thermostats and thermal fuse. Thermal fuse failed test. Replaced thermostats and thermal fuse. Dryer works! 

Online watched a couple videos ordered parts, the son came over and installed. Hooray for great son, your website easy ordering, parts available no more wet clothes draped around the condo. And didn’t need to buy a new dryer!!.