Hydro-Flame 8535-IV won't light

[Al and Missy]

I tried to use the furnace one morning while we were out for the last two weeks and it wouldn't light. Symptoms are:
1. Fan runs
2. Gas valve opens, I can hear the click and smell gas in the exhaust.
3. Furnace doesn't light, fan continues to run, gas turns off.

I reset it and tried several times, no difference.

I pulled the igniter wire at the control board and tried again after re-start. There was no apparent spark from the coil to the igniter wire.

My conclusion is that the sail switch is good since the gas valve is turning on. The only thing I can see that would cause spark to fail once the gas valve is open is the control board.

Any other suggestions before I order one?

Thanks,

Al