Keeprite NG furnace code "fail to ignite"

Well, dunno why, but after 3rd or 4th cycle it lit. I didnt measure voltage at all, as it lit this time.
Hard to believe but at 14 years old this furnace is well beyond its 1/2 life....
Now to find a filter on Thanksgiving lol
Thanks all, I appreciate it. I'm not totally comfy messing with NG, but i figured we were "safe" as there is was no smell and nothing obviously was broken.
Irony is there are incentives here in Ontario(gov grants) to install a heat pump as a primary heat source as long as you have backup heat(furnace). But our 14yr old furnace is not on the "approved" list lol. So in order to get $6500 towards a heat pump I have to buy a new furnace lol.
Thanks all