Ours tripped apparently due to a power blip during a storm. I googled some info and found that you just need to place a magnet for a few seconds on a specific part of the black box that houses the switch . Took a couple tries and a stronger than my small tool retrieval magnet but it worked for me. There is good info with pictures on the internet.
Now..if it tripped due to high temp (not a power blip) I would watch it real close to see what's going on after a reset or get a qualified repair tech to have a look. Don't want to burn the place down..
Cheers