I pulled the unit after figuring out how it's mounted and struggling with the three top bolts stripped in their screwdriver heads during initial build. The 250v 20a fuse checked out good. I found some info on a high limit thermostat being a possible solution, and I located two similar thermostats fixed on the bottom just behind the control panel. My multimeter says one is open and the other closed. I believe a failed one of these two has caused the total failure of the unit as one online lead I found indicated. I ordered one of each for $9 plus shipping and I understand that one of these is bad but it is only some very limited suggestions and guidance that I've found on the internet. I'll try to remember to post again after completing my hopefully successful repair!