Lennox 80W58 Pressure Switch

For service calls involving intermittent furnace shutdowns or inducer blower faults, the Lennox 80W58 Pressure Switch is the direct OEM replacement engineered to maintain system integrity. This single-stage air pressure switch features a precise .75" WC factory setpoint, critical for verifying proper draft and venting before the ignition sequence begins. Designed for compatibility with high-efficiency Lennox, Armstrong, and Ducane gas furnaces, this SPST normally open (N.O.) switch operates on a 24V control circuit, ensuring the inducer motor reaches the necessary vacuum levels to safely flue combustion gases. Replacing a faulty or fluttering switch with this genuine 80W58 furnace part prevents nuisance trips and ensures your client's heating system meets HVAC safety standards and operational specs.

• Precise Pressure Calibration: Factory-set at .75" WC to ensure accurate vacuum detection and reliable combustion air proving.
• OEM Compatibility: Direct-fit replacement for 80W58 and cross-referenced with various Lennox Armstrong Ducane models to eliminate installation guesswork.
• Durable SPST Contacts: Features heavy-duty single-pole, single-throw contacts designed for 24V AC heating control circuits.
• Enhanced Safety: Acts as a critical limit safety guard that prevents the furnace from firing if venting conditions are obstructed.

What are the symptoms of a failing Lennox 80W58 switch?
Common signs include the furnace blower running without ignition or receiving a specific pressure switch lockout code on the control board. If the inducer is running but the switch fails to close at .75" WC, the system will prevent the burners from firing.

How do I verify if this pressure switch is faulty?
Using a manometer, measure the actual vacuum produced by the inducer motor and compare it to the .75" WC rating. If the pressure exceeds the rating but the 80W58 contacts remain open (checked with a multimeter), the switch requires replacement.

Can I use this for multiple Lennox furnace models?
Yes, this is a versatile part used across numerous single-stage platforms. Always check the pressure rating stamped on your existing switch to ensure a .75" WC match before installing.

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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.