Gibson furnace is having intermittent issues. Performed full diagnosis and determined issue is with circuit board. It is a two stage furnace and the second stage is not initiating. It was set for auto stage short. I determined it cycles only in first stage and will not go into second even if forced to second stage. Recommend replacing the board but because of the age of the furnace we cannot guarantee any other issues will not arise. Highly recommend replacing the furnace to receive peace of mind warranty. A sales team member will be in touch with options.