I have a dual stage furnace. most of the time it works fine but 1 or 2 times a day it calls for heat, inducer motor starts, it lights up and the blower starts, after the blower being on 10 seconds the inducer slows down and the burners cut out. The blower goes for a bit and then turn off and the inducer starts again to start the process. But now the pressure switch on the condensate line clicks and when it comes time to start the burner it will not even start. The next time it starts hard and it still goes out. It does this for 10 -15 minutes each time getting better until it finally goes back to normal. I am trying to find out what the issue could be as we have checked the pressure switches themselves, the flame indicator and gas line. Frigidaire
If this is a condensing furnace, make sure that all the condensate drains are open and not plugged with dirt. There is also a "drain trap" that may need to be flushed with water to clean it out. When the furnace fails count the flashes of the red light on the circuit board and it may indicate where the failure is.