Remove and replace PS1 pressure switch attempting to resolve no heat issue from this morning. Furnace showing PS1 open and PS1 closed errors switch seems to be sticking and not returning as desired Quote# 25619630. Pickup at Trane WEST Upon arrival unit was in an error loop for PS1 kept attempting to start and switch would close then release as if motor was not staying on but motor continues running fine. Replaced pressure switch and unit instantly sensed the switch working properly closing and holding and fired up. Test ran unit and no more issues after new switch