Lennox 67K32 Pressure Switch

As a seasoned technician, you know that a failing Lennox 67K32 furnace pressure switch is often the culprit when a unit refuses to ignite or locks out after the inducer motor engages. This genuine OEM Lennox 67K32 replacement is a critical safety component designed to verify proper drafting and combustion air pressure before allowing the ignition sequence to proceed. Engineered for precision, this 0.34" WC pressure switch features a single-pole single-throw (SPST) configuration, ensuring a reliable electrical path to the control board only when the exact pressure set point is met.

This HVAC induction pressure switch comes with a standard 1/4" barb connection, making it a direct-fit replacement for older or failed Honeywell and Lennox assemblies. It is widely compatible with various Lennox, Armstrong, and Ducane gas furnaces, frequently replacing obsolete part numbers like 18J33, 18J3301, and 67K3201. Built with rugged internal components to withstand the vibration and thermal cycling of high-efficiency heating environments, this switch eliminates common nuisance trips caused by diaphragm fatigue in generic alternatives. When troubleshooting pressure switch stuck open codes, always check for condensate backup or restricted venting, but if the switch itself has met its service life, this OEM unit restores factory-spec safety and performance.

• Precise 0.34" WC Set Point: Calibrated to exact OEM specifications to prevent unsafe furnace operation and improper venting.
• Durable SPST Contacts: High-quality electrical contacts designed for frequent cycling without premature pitting or failure.
• Standard Barb Connectivity: Features a 1/4" barb for quick and secure attachment to existing pressure switch hoses.
• Direct OEM Replacement: Ensures full compatibility with Lennox inducer motor assemblies and mounting brackets.

How do I know if my Lennox 67K32 is bad or if it's a venting issue?
If your inducer motor is running but the igniter never glows, use a manometer to verify the draft pressure. If the pressure exceeds 0.34" WC but the switch remains open (check for continuity across terminals), the switch is faulty. If the pressure is below the set point, check for a clogged flue, a cracked collector box, or a blocked condensate drain.

Is this switch compatible with multi-stage furnaces?
The 67K32 is a single-stage (SPST) switch. While many Lennox furnaces use multiple switches for high and low fire, this specific model is only designed for applications requiring a 0.34" WC closing pressure. Always match the WC rating on the label of your existing part.

Can I use a universal pressure switch instead of the 67K32?
While universal kits exist, they often require manual calibration. Using a genuine OEM 67K32 ensures the safety logic of the control board is maintained with the exact factory-defined pressure thresholds, preventing potential combustion issues.

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.