773-314

This high-quality furnace air pressure switch is a critical safety component designed for residential gas furnaces and HVAC systems. Also known as an air proving switch, its primary function is to monitor the vacuum pressure produced by the draft inducer motor, ensuring that the exhaust flue is clear and the system is venting safely before the ignition cycle begins. With precise factory-set trip points of -0.55" WC and -0.65" WC, this dual-function switch detects airflow obstructions or inducer motor failures, preventing the furnace from operating under unsafe conditions. If your heating system is cycling improperly or showing a pressure switch fault code, this replacement part is essential for restoring reliable furnace performance and home safety.
Type: Air Pressure Switch
Size: Standard
Application: Gas furnaces, central heating units, and residential HVAC equipment requiring air proving safety verification.
Specifications: Pressure Set Points: -0.55" WC / -0.65" WC; Function: Vacuum/Draft Pressure Sensing