System not working upon arrival. System had a pressure switch fault code. Did not find any blockages in lines or venting. Inducer motor makes enough air to close switch. Replaced failed switch with new, then tested operation. Furnace still had a pressure switch fault. All three safety switches in pressure switch circuit was closed. All other switches working correctly. Spoke to manufacture, control board and wire harness would have to be replaced. Due to age and condition and possibility of additional issues, replacement is the best route. Replacement scheduled for Thursday.