Keeprite NG furnace code "fail to ignite"

If it never lights at all, I'm betting on the gas valve myself. Still a possibility it's the pressure switch depending on how good the diagnostics are, but I really doubt it.

Also check the flame sensor for being open just to be sure.

It should be somewhat like inducer or powered exhaust turns on -> ignitor starts sparking or glowing -> gas valve opens -> flame lights -> checks flame with flame sensor -> burns for a time -> blower kicks on