Well, glad yours is fixed. I've cleaned out the condensate trap, inducer is new, the vacuum/pressure switch seems ok but I don't know how many in's of mercury should activate it to know if it's the problem. Good blue flames from the burners. Hi-limit switch seems very unlikely according to a hvac source. I'm stumped. I got the house up to 73 so it's good enough, but I should be able to crank it to 80 like I used to.