773-003

This premium two-stage air pressure switch is a critical safety component designed for high-efficiency residential gas furnaces and HVAC heating systems. As an essential air proving switch, it monitors the vacuum pressure generated by the draft inducer motor to ensure proper venting of combustion gases before allowing the furnace to ignite. Specifically calibrated for two-stage heating cycles, this sensor detects two distinct pressure levels to manage both low-fire and high-fire operations safely. If your furnace is experiencing ignition failure, frequent lockouts, or pressure switch error codes, this replacement part provides the precision needed to restore reliable heating performance. Engineered for durability and high-heat environments, it helps maintain the safety and efficiency of your home's central heating system by preventing the operation of the burner under unsafe venting conditions.
Type: Air Pressure Switch
Size: Standard HVAC Component
Application: Two-stage gas furnaces, residential forced-air heating systems, and combustion air proving applications.
Specifications: Dual-stage calibration; Low-stage setpoint: -0.20" WC; High-stage setpoint: -0.40" WC; Designed for draft inducer motor pressure monitoring.