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If you are watching it happen to you hear a click, like the gas valve opening?
Is there a small window in the blower door that if you look in see a LED blinking? Count the blinks
The only click I hear is the relay for the blower and the differential switch. I wasn't able to locate any LEDs.
There is a draft proving switch. It is a round silver control with two wire go to it.Turn to switch off. If you remove one wire and turn the furnace on after the draft motor come up to speed touch the two wire together.. If the ingnitor comes on the problem is in the draft proving circuit. If not I would bet the ingnitor is bad...
Oh where to you live. Is the flue piping buried under snow form the storm in the northeast today???
The only Round silver control I can see is what I called the differntial switch. It has 3 wires N.O. and N.C. contacts. i Jumpered the N.C. contact so the inducer blower would start and then moved the jumper to the N.O. contact and still nothing happened.
I am sorry i just looked and it seems you furnace has a spark ignition system not hot surface. . Can you see the pilot burner? Just kicks tap it with a screwdriver handle. If nothing carefully remove the orange spark wire. While it is running hold the tip close to something metal on the furnace. Does it spark?
It is a small back or gray box with the orange wire coming from the center, Correct?
What did you jump on that box? It should be two 24 volt wires and the spark wire
If you have no spark the ingnitor is bad. If you have 24 to it and no spark that is it. you can try to light it with a long match or one of the new long lighter. Start the furnace and try lighting it. Gas should be following from the pilot. You will only get one cycle but better then nothing
The part number of the ingnitor box is LH33WZ510.
Hope this helped and good luck. Please accept and positive feedback is appreciated