My furnance HSI does not get hot - the draft induce fan turns on for a minute or two and then turns off and clicking sounds are heard during this process but the HSI does not get hot - from other posting I have -checked the four roll out sensors surrounding the chamber and all have continuity -removed the multivolt pilot sensor and cleaned with steel wool - cleaned all grounding wires -checked for leaks on hose from inducer motor to pressure switch After the inducer motor stops the status light on my circuit board blinks once - to check gas pressure, gas valve, gas flow and flame sensor since I cant check the gas valve and I know I have gas, my assumption is the gas valve or the flame sensor (multivolt pilot sensor) - I guess replacing the flame sensor woud be the logical thing to do first since this is simple - but where would I get one...

Title says it all. Only the inducer should start for a pre-purge, but the inducer AND blower motor kick on at the same time. When there's a call for heat, both fans kick on and I get a blast of cold air for about a minute or two before the burners light. I'm learning the trade currently but the IFC is different than the ones I've worked on. I see no blower timer at all. It's a White Rodgers D341418P01. I have no doubt the installer wired it incorrectly (they messed up a couple of other things - it was installed a few years ago before I knew any better). Any thoughts?