Lennox 31L11 Pressure Switch – OEM Furnace Air Pressure Switch (31L1101):

The Lennox 31L11 Pressure Switch (31L1101) is a genuine OEM furnace air pressure switch engineered to maintain safe and efficient operation of compatible Lennox gas furnaces. This critical safety component monitors negative pressure created by the inducer motor during the heating cycle. When the correct airflow and vent draft are detected, the pressure switch signals the control board to allow ignition. If pressure is insufficient or outside specified limits, it prevents ignition, safeguarding the furnace and home from unsafe combustion conditions.

Built to exact factory specifications, the 31L1101 pressure switch delivers reliable performance and long service life. Its precise diaphragm and switch mechanism ensure accurate pressure sensing, reducing false shutdowns and improving system responsiveness. Designed for professional HVAC service and residential furnace maintenance, this OEM part fits seamlessly into Lennox furnace models that require the 31L11 series pressure switch.

Key Benefits:

• OEM Quality & Compatibility: Genuine Lennox replacement part for reliable fit and performance.

• Safety-Critical Function: Ensures proper airflow and venting before allowing furnace ignition.

• Durable Construction: Designed for extended service life under typical operating conditions.

• Improved System Reliability: Accurate pressure detection helps minimize unexpected shutdowns.

This Lennox pressure switch is ideal for HVAC technicians, service professionals, and homeowners performing routine maintenance or furnace repairs. Installing a genuine OEM pressure switch helps maintain optimal furnace efficiency, promotes safe operation, and supports long-lasting heating performance.