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If you're generating a spark then the igniter is working. You need to check if you have 24 volts to the gas valve while the igniter is sparking. If you don't then the board is suspect. If you do have 24 volts then you need to check if you have gas to the pilot (assuming this unit has a pilot) by disconnecting the tubing to the pilot where it connects to the gas valve. If you have gas then the pilot orifice is likely blocked and you need to remove it and pass a very fine wire through the orifice hole(the hole is ~0.01") to clean it out.
You have to probe the leads to the gas valve. The typical terminal designation is PV, MV & MV/PV or C (common) P & M. You should have 24v to PV & MV/PV or P & C while the pilot is arcing