Product review (5 stars): Try this before you buy it.
Here's a suggestion. If your high-limit is bad (NOT the bigger resettable!) you can reset the high-limit fuse by smacking it to the ground. Seriously. Start off with a medium smack, and smack it increasingly harder until you get continuity. There's a "spring" inside it that resets. I'd use a meter, since it's a PITA to test inside the unit. I had to throw mine down on concrete, but it worked