Keeprite NG furnace code "fail to ignite"

Sounds like you have either a bad gas valve or blocked gas orifices (little green spiders can crawl in the orifices and make a nest blocking gas flow - seen it many times in my 22 years in HVAC)
Also, make sure you have gas to the furnace.
That is interesting. In the years I was in HVAC/R service, I have never once seen fully plugged orifices