Service recall No active faults upon arrival Noticed it was running in low fire Dipswitch set for auto staging, but it would never initiate high fire Wired thermostat for 2 stage heat and cool operation Furnace now running in high fire I think it's been running in low fire for a while and it was enough to maintain set point Pressure switch failure made it get cold inside, low fire couldn't catch up Explained control board may be starting to fail, agreed we will see how true two stage control from the stat behaves