Its time to turn the heat on- But, heat will not start. Tried running just fan= fine. Tried running AC= fine. Turn on heat at thermostat= nothing other than an audible click at furnace. Took off covers to furnace and can see the 0ne red LED (off) Two green LED's -Both on when power is on and thermostat is off. When I turn on the thermostat to call for heat- there is a click at the furnace and the middle LED blinks (blink-blink-pause, blink-blink-pause, etc).

Any idea as to what to do? My fear is that we need a new IFC- which sounds very expensive.

Look at the code on the air handler door or control board. Does the inducer fan start? The first thing is to look for a blown fuse on the board. With a no start condition, the first thing to check is the tubing and ports from the inducer to the pressure switch.

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Originally Posted by ma0641

Look at the code on the air handler door or control board. Does the inducer fan start? The first thing is to look for a blown fuse on the board. With a no start condition, the first thing to check is the tubing and ports from the inducer to the pressure switch.

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The code on the door suggested checking the pressure switch- I checked the tube and the ports and the were clear.
After I checked the ports and tube and put them back- then tried to run the furnace again, I noticed the inducer fan blades turned a very little bit... then nothing. One thing to add- when I turn it on both green lights remain lit for one minute and I can hear a very faint hum when I turn my ear near it- then the hum stops and the OK light begins blinking twice with a pause then repeats.
I checked for blown fuse- I only found one fuse it was in a line from the transformer and it was good.

May be a bad inducer. That is the first thing that comes on. If it doesn't build up enough pressure to close the switch, nothing else will work. Look on EBay, I just sold a used Fasco for $50.