Keeprite NG furnace code "fail to ignite"

Steve this big push to heat pumps is BS. ALL heat pumps, unless they are in Tucson, require backup/ emergency heat, for two reasons----for additional heat during the temp range that the heat pump cannot produce enough, and full backup (no heat pump) for when it gets really cold or when the heat pump develops a problem. Since "they" are pushing for all electric, that means ELECTRIC backup heat.

So far as your problem, I would worry about WHY. WHY did it decide to quit, and why did it decide to start working?