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Does the small vent motor come on when you call for heat?
Does the unit have a spark ignition ignitor and if so does it spark?
Below is a troubleshooting chart on the ignitor. Lets remove cable and se if we have spark at module.
With wire disconnected we should here the box clicking.Check the wire to make sure it is not broken internally and clean the ignitor with emory cloth or fine sand paper.We will go from here.
Did it run until thermostat satisfied?
Try a hard reset by turning power completely off then re try and see what we get
Sounds like that module may be failing if it was clicking before but now will not click at all unless a limit opened.Do you get a flash code like flash flash flash flash pause, repeat?
I suspect you did, but did you remove the wire and check it for continuity and see if box would click again?
I suspect module to be issue
Wow.Glad you noticed that before replacing board.So many little things that can make such a tremendous difference that I can not see via internet.Just let me know if you have more problems.