I found the system tripped the high limit on the system. Talking with other techs they had found that limit removed from the system on the last heating maintenance and they reinstalled it. We are going to change out the limit. Shipping to the shop and should be there in 5 to 7 days. I also found the bypass damper was sticking closed so I adjusted the range of the damper so it will not get stuck again. At this time the unit is running as its should be