Calling TGPs HVAC experts I have a Ducane gas furnace model number 92G1UH070BP12. It's been off for a few days I was gone and came home to a house with temps at 34, frozen water lines in the crawl also. The unit calls for heat but when starting up it will try to ignite the burners but fails. I thought it may have been a frozen condensate line so I disconnected the line but it's will not light off. I'm getting an 3 flashes error on the control board = (pressure switch open with inducer on) I waited for the burner and fan to come on and tried to jump the pressure switch out but it's still not igniting. I have fuel, stove works and clothes dryer too. Any HVAC experts know what to try next? Glow switch gone bad maybe? Thanks!