773-031

This Lennox 2-stage air pressure switch is a vital safety component engineered for high-efficiency gas furnaces. As a dual-stage air-proving switch, it serves as a vacuum-sensing device that monitors the draft created by the inducer motor, ensuring combustion gases are safely vented before the ignition cycle starts. This specific model features two distinct pressure thresholds (-0.50" WC and -0.90" WC) to accommodate both low-fire and high-fire operation modes in multi-stage heating systems. If your furnace is cycling incorrectly, failing to ignite, or displaying pressure switch lockout error codes, this replacement switch restores reliable performance and ensures the appliance operates within safe manufacturer specifications. Built for precision and durability, it helps prevent the accumulation of hazardous flue gases by verifying proper airflow throughout the heating process.
Type: Air Pressure Switch
Size: Standard HVAC Control Component
Application: Used in residential two-stage high-efficiency gas furnaces to monitor inducer fan performance and ensure safe venting of combustion byproducts.
Specifications: Switch Type: Dual-Stage (2-STG); Low-Stage Pressure Rating: -0.50" WC; High-Stage Pressure Rating: -0.90" WC; Sensing Type: Air Proving/Vacuum.