Lennox 14A45 Dual Stage Pressure Switch WC - 0.50/0.90

The Lennox 14A45 is an OEM dual-stage pressure switch designed to ensure safe and reliable operation of Lennox gas furnaces and HVAC systems. This critical safety component monitors airflow through the inducer assembly and confirms adequate draft conditions before allowing ignition to occur.

Key Features:

• Dual pressure settings: 0.50" and 0.90" water column (W.C.)
• 2-stage SPST normally open switch configuration
• 5 amp electrical rating, 120-277 VAC compatible
• Factory-calibrated for Lennox equipment specifications
• OEM replacement quality ensures proper system integration
• Prevents unsafe operation and ignition lockouts caused by inadequate airflow

This pressure switch protects your heating system by preventing startup under unsafe draft conditions. It replaces original part numbers 104549-03, 93W79, and 103613-03. The 14A45 is designed specifically for Lennox and select allied brand furnaces, featuring matched fittings and connectors for straightforward installation. When your furnace displays airflow-related fault codes or fails to ignite, a malfunctioning pressure switch is often the culprit.