773-143

This premium dual-stage air pressure switch is a critical safety component designed for high-efficiency gas furnaces and HVAC systems. As an essential air proving switch, it monitors the vacuum pressure produced by the inducer motor to ensure proper venting of combustion gases before the ignition sequence begins. Engineered for dual-stage heating units, it features calibrated set points of -0.20" WC and -0.35" WC to maintain precise system performance. If your furnace is failing to ignite or throwing a pressure switch error code, this reliable replacement part restores safe operation and peak efficiency to your heating equipment. Built for durability and accuracy, it prevents hazardous operation by shutting down the system if inadequate airflow is detected.
Type: Air Pressure Switch
Size: Small
Application: Commonly used in residential gas furnaces and HVAC systems to monitor combustion airflow and ensure safe blower operation.
Specifications: Two-stage operation; Calibrated set points: -0.20" WC and -0.35" WC; Function: Air proving and vacuum monitoring