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I did that just now, then waited for 3 failed ignitings, then the "indicator light"(green light) blinks once: "ignition failure". What now? Could it be the sensor rod? or Ignition switch?
The gas is flowing okay... I turned furnace on with gas off, waited until I could see the "element(?)" glow, and then turned gas on and it ignited and ran for close to 3 minutes then shut down.
Ok, I see we are on the same page. To test the theory (and this is for test only)
remove the 2 wires from the pressure switch. Start the furnace, and after the draft fan is running connect the 2 wires together. This simulates the air switch holding the contacts closed. Remember though that to start, the wires cannot be touching. Start with them apart and join when draft fan runs.
Nothing happens, or I should say, the same problem.
When I am blowing thru end of tube of pressure switch, I can see thru little window when it begins to glow, then when the flames ignite, and then they go out; there's where the problem is. Sorry if I'm getting you messed up.
Not on propane.
So does that mean a new control board?