Lennox g40uh error "Primary or Secondary limit switch open"

I have test the continuity on both limit switches and on the flame roll over switches. Along with a few other things. Could it be the control board?

Found this in the manual under troubleshooting. The ignition control is equipped with two LED lights for troubleshooting. The diagnostic for that code is: LED #1 slow flash, LED#2 is on
"Primary or secondary limit switch open. Limit must close within 3 minutes or unit goes into 1 hour WatchGuard." That is what you are getting? Did you check the high limit?
Are you locked out in the Watchguard?