Lennox 24W98 Pressure Switch

Ensure the safe and efficient operation of residential or commercial heating equipment with the Lennox 24W98 Pressure Switch. This factory-authorized OEM replacement part is engineered for high-precision monitoring of flue gas and combustion air pressure. Designed to actuate at -.31" WC, this SPST (Single-Pole Single-Throw) switch serves as a critical safety component, preventing the furnace from firing if proper venting is not detected. This unit features a standard 1/4" barb connection for easy vacuum hose integration and a robust zinc-plated steel or high-temperature plastic housing, depending on the current production run. It is a direct fit for several Lennox G40DF and G50DF series furnaces, as well as units from Allied, Armstrong, Concord, and Ducane, ensuring compatibility and reducing time on the job site.

Key Benefits for Technicians:

• Precise Trip Point: Calibrated to actuate at exactly -.31" Water Column to maintain strict airflow safety standards.
• Broad Compatibility: Replaces obsolete part number 101231-02 across multiple Lennox and Allied Air brands.
• Professional Grade: Features a durable, precision-engineered diaphragm for reliable switching in demanding HVAC furnace repair environments.
• Quick Installation: The 1/4" barb connection and labeled terminals allow for rapid swap-outs during emergency service calls.

Common Questions & Technical Support:

What are the symptoms of a failing Lennox 24W98 pressure switch?
A faulty switch typically triggers a specific diagnostic flash code on the furnace control board, often indicating "Pressure Switch Stuck Open" or "Pressure Switch Stuck Closed," which prevents the inducer motor from completing the ignition sequence.

Can I use a pressure switch with a different water column rating?
No. For safety and performance, you must use a switch that matches the manufacturer's specified setpoint of -.31" WC. Using an incorrect rating can lead to hazardous combustion conditions or frequent system lockouts.

Does this switch include the mounting bracket?
Yes, this Lennox furnace pressure switch typically comes with the integrated mounting bracket and is designed to fit the original screw patterns of the specified models.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.