My heat system which made by white-rogers model 50A50-241 is has lockout problem. I am getting cool air 99.99%. It works then go next time lockout mode any help please? Thanks:confused:

If the gas comes on for a few seconds and goes off, likely there is a problem with the flame sensor. Try cleaning it. If it still doesn't work, replace it.

Is this a Trane/American Standard furnace? 80 or 90% efficient? Are you just getting the 2 flash code error?