I have a carrier super saver furnace. I shut it off to tighten up some loose bolts on the inducer fan motor. I also cleaned the motor up a little with some WD40. After turning the unit back on, the blower motor immediately kicked on and that's all it does. The inducer motor does not come on and it either does not respond to a call for heat or doesn't receive one. I can jumper W & R together and still no change. However if I jumper SEC1 to W, then the blower motor stops, the inducer fan starts and the spark ignitor starts to spark, but the pilot doesn't light, nor does the heat come on.
There is no standing voltage at W or R. There is 24+ volts at SEC1 and all the way up to one side of the high limit switch, but not on the other side that returns back to R. I can measure 24 volts from SEC1 right up to what looks like a resistor or maybe a diode that is on the end of the wire that connects to the high limit switch, but the voltage is not measurable on the other side of this component which connects to the high limit switch and returns to R. Don't know if this is normal or not, but one thing for sure is no power at R.
I can jumper SEC1 to W and get the blower to shut off and the inducer to kick in, spark starts sparking, but no pilot, no heat. Any ideas? I tried replacing the inducer board and the fan blower board, neither of which had any effect. It appears that voltage is getting to the gas valve, but it seems as if the valve is not opening, neither for the pilot or for heat.
Any help would be appreciated.