Have HVAC Questions? Ask an HVAC Expert for Answers
Try this. Remove the rubber hose from inducer and leave attached to pressure switch. Call for heat and allow inducer to start,Then suck on hose and see if pressure switch closes and ignition takes place.
Did furnace work while sucking on hose?
Leaving office tonight.If you want to continue tomorrow,I will be around. If furnace comes on when sucking on hose, make sure vent is not blocked and no water in tubes. Next will be to remove the inducer and make sure blades are not broken or deteriorated and nothing inside like a small bird or debris.We will go from here.
If all are clear we will need a vacuum tester to see how much vacuum the inducer is actually pulling on the switch