The Lennox 14A43 (104549-01) 2-stage pressure switch is an OEM safety and performance component designed for consistent airflow monitoring in high-efficiency Lennox furnace systems. This dual-stage switch features two calibrated set points—0.90" W.C. for high stage and 0.45" W.C. for low stage—to ensure proper draft induction and safe burner operation throughout the heating cycle. As a direct Lennox OEM replacement, it helps prevent furnace malfunction, short cycling, and ignition issues caused by improper pressure readings.

This pressure switch is engineered to meet Lennox’s strict manufacturing and reliability standards, ensuring accurate performance, long service life, and seamless compatibility with compatible two-stage furnace models. It is an essential diagnostic and replacement part for HVAC technicians and homeowners maintaining system efficiency and safe combustion airflow.

 

Key Features:

• Genuine Lennox OEM 2-stage pressure switch
• High-stage set point: 0.90" W.C.
• Low-stage set point: 0.45" W.C.
• Ensures proper inducer and combustion airflow monitoring
• Helps prevent ignition failures and pressure-related fault codes
• Reliable, factory-calibrated performance
• Direct replacement for the original 104549-01 component