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Should have flash code that tell you the problem. If you have resistance on the ignitor and it does not glow. It is a bad board that is the problem. Relay inside board that brings on ignitor is bad. Russ
You would not have a flash if transformer was bad. What color is the light flashing. Yellow/amber green or red. Russ
The ignitor comes off the board. Please take photo of board and attach please.
If you have a voltmeter unplug the ignitor. Set meter on 200 volts and turn on furnace to see if you have voltage to ignitor. Russ
On board swap TR and TH wires and retry furnace. Russ
Just trying to rule out board. Russ
Great job. Thanks Russ