i know that the blower wasnt working in my unit ,which is in the attic, and i decided to take the panel off for the breaker (power off of course) to see what was going on/check see if i had a bad breaker in there,,dug a little further into the breaker box,moved the insulation ect, and found a little 5 amp fuse just as used in vehicles..all i had was a 7.5,put that in there,covered the face of the opening,turned the power on, ran perfect! shut power back down put everything back together,been running just fine for three yrs, no issues.I wonder how much a service call, and a tech putting that in there would have cost me????A little fuse