Originally Posted by bigMikeB
There are three terminals on the pressure switch, "C", "NC" , and "NO" . When the fan is off the "NC" and "C" should have continuity, when the fan is on the "NO" and "C" should have continuity. If that isn't what happens the switch is shot. The inducer fan should only run when there is a call for heat to the control board on the "W" terminal. If the inducer is running when the wire is removed from that terminal, change out the board.
Ok so I feel I am mistaken on what I took for the pressure switch and what is the actual pressure switch....
I assume the switch under the exhaust motor is the pressure switch? My first assumption was that the actual switch behind the diaphram was the switch?
So I am taking it that the little micro switch or whatever on the back of the diaphram where I marked "A" is not the pressure switch. "B" is the actual pressure switch?
C - Flame sensor
and "D" that you can't see cause its cut off is the high rollout sensor that looks similar to "B" but is right above the burners.
Am I correct in all this? Or am I completely off lol