OK so I cleaned the T1 sensor, blew it out with air and vaccumed the hole I removed it from, the T2 sensor is really not cleanable, it just sits against the firebox, maybe senses surface heat, but the T2 is right inside the chimney exhaust chamber and whats interesting is its kind of a ceramic tube with a tiny sensor inside and that tube is open to the outside, kinda surprised it doesn't leak any chimney gases, but maybe the flue exhaust is constantly pulling out ? Ok so it ran abt. 5 hours never shut down, then I shut it down for the night, came down this morning, fired it up, ran abt. 10 minutes and shut down ugh ! But the interesting part is, this is the first time I was actually standing next to it when it shut down ! It was on high and the fan just stopped abrubtly and stopped feeding, like someone pulled the plug, so I immediately switched it fan to see if the fan would work, and it worked, then I immediately switched it to high and it started feeding and the fan was on like nothing ever happened, does this mean anything ??? It has now been running for abt. 3 hours non stop, I'm stumped. On another note I sent an e-mail to Thelin's "techincal assistance" e-mail. They told me they don't have technical assistance you need to contact a dealer for service ?? ugh I also ordered the brushes figured I'd swap them out for prevntative maintainence !