773-042

This premium 2-stage air pressure switch is a critical safety component designed for high-efficiency gas furnaces and HVAC heating systems. Functioning as an air proving switch, it monitors the pressure differential created by the draft inducer motor to ensure that combustion gases are being safely exhausted before the ignition sequence begins. Featuring dual setpoints of 0.2" WC and 0.5" WC, this part prevents the heating system from operating under unsafe conditions, such as a blocked flue or a failing vent motor. If your furnace is failing to ignite or showing pressure-related error codes, this durable replacement switch ensures reliable performance, peak heating efficiency, and continued home safety.
Type: Air Pressure Switch
Size: Standard
Application: Used in multi-stage gas furnaces, forced-air heating units, and residential HVAC systems to prove inducer motor airflow.
Specifications: Two-stage (2-STG) operation; Actuation points: 0.2" WC and 0.5" WC; Air proving safety functionality.