Main level - 16 year old Trane System System not heating due to age mostly. The system is flashing a pressure switch error code. The pressure switch is working as it should but the system is not pulling a strong enough vacuum for it to close the pressure switch. I checked the exhaust and intake vent, checked the tube for cracks, checked the port to ensure it was not blocked, and checked the heat exchanger for cracks/holes. The heat exchanger has multiple cracks and some rusted areas, along with metal fatigue and hot spots. Most of the other components in the furnace are original and weak, such as the igniter, flame rectifier, blower motor, inducer motor, etc… After going over the age, condition, and cost of temporary repairs, the homeowner requested we send out an install supervisor to go over updating the equipment. I have scheduled this with dispatch for today. Thank you for choosing T.E. Certified, have a great day!