Keeprite NG furnace code "fail to ignite"

67Dart273 said
That is interesting. In the years I was in HVAC/R service, I have never once seen fully plugged orifices

Spiders nests in the main gas orifices may be a regional issue.

It was a problem in the Bay Area - California.
My wife also had recurring issues with this in her wall heaters in rural Arkansas.