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Can you give me complete model from inside furnace in burner compartment so I can provide guidance with this specific unit.Model will be on a label just above burners on right or left inside panel
Then look in blower compartment and see if we have a control board with a blinking light.If so tell me the pattern of that flash.That will indicate what is wroung and tell us where to start troubleshooting.
Do you have a volt meter to see if we re getting 24v to gas valve when igniter tries to light?
OK do you have a meter to see if igniter is getting voltage.Also look and see if it is burned if you have the glow type.
Issue is going to be inside the furnace.Either not getting power to igniter or bad ignite