GoldDigger, yup the fuses are both blown. I wanted to wait to replace them to do some research. It seems the cold weather kit is also wired from the sensing circuit. And the night in question the temps were below 34 in the outer areas so Im leaning towards this to be the answer. Im trying to figure out if maybe the conductor size is too small for the added load. I wouldn't think so but nobody had the fuses today so it gives me time to research. It says the heating units are self operating meaning they control themselves when the temp gets to low. I think total watts were like 35watts. Im wondering if they could've possibly built up enough heat and with too small of a conductor, inability to dissipate the heat, that the fuses blew. I pulled in a 16/7 cable in conduit at the advice of the generac company in the area, against my wishes, I used single conductor 14g in conduit on previous install. The fuses fast acting. I think this design is less than favorable, nothing should be on the sensing circuit, if so then whatever else is on should be fused after the sensing unit IMO. What are your thoughts.