Lennox 58H31 Pressure Switch

The Lennox 58H31 Pressure Switch is a critical safety component designed for precise draft verification in residential and light commercial HVAC systems. This genuine OEM part features a factory-calibrated 3.00" WC (Water Column) set point and a Single-Pole Single-Throw (SPST) configuration, ensuring the inducer motor establishes proper static pressure before allowing the ignition sequence to proceed. As the verified direct replacement for the legacy Lennox 28G1201 (also indexed under 28G12 and 58H3101), this switch maintains original equipment performance standards and helps prevent hazardous conditions like back-drafting or incomplete combustion.

Built with a durable diaphragm and a dual 1/4" barb connection for secure vacuum line attachment, the 58H31 furnace pressure switch is engineered to withstand the rigorous heat-cycling environments of modern high-efficiency furnaces. For technicians troubleshooting frequent "pressure switch open" fault codes, this Lennox replacement part offers a reliable solution to ensure HVAC system compatibility and long-term diagnostic accuracy. Vertical mounting is recommended to optimize diaphragm sensitivity and prevent moisture accumulation within the switch body.

• Direct OEM Cross-Reference: Expert-tested replacement for 28G1201, 28G12, and 58H3101, eliminating field-adjustment guesswork.
• High-Accuracy Sensing: Consistent 3.00" WC trip point provides reliable safety monitoring for high-static combustion environments.
• Robust Interface: Dual 1/4" barb connections ensure a leak-proof seal with standard silicone or rubber pressure tubing.
• System Safety: Prevents burner operation during flue obstructions or inducer motor failure, protecting the heat exchanger from damage.

• Will this fix my "Pressure Switch Open" error code? While the 58H31 is often the solution, ensure the flue pipe is clear of debris and the inducer motor is reaching full RPM before replacing the switch.
• Is this compatible with other brands? This switch is also a confirmed replacement for specific Allied, Armstrong, Concord, and Ducane part numbers (including 58H3101).
• Can I use this for both intake and exhaust monitoring? Yes, its SPST design and 3.00" rating make it suitable for specific Lennox furnace models requiring this precise set point for draft verification.

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.