Lennox 14T64 Pressure Switch

The Lennox 14T64 Pressure Switch is the definitive OEM replacement for 103612-04, engineered for 2-stage furnace applications requiring precise gas furnace pressure switch calibration. As a critical safety component, this dual setting pressure switch monitors the inducer motor's draft and internal static pressure, ensuring the combustion environment is stable before allowing the ignition sequence to proceed. Designed specifically for Lennox high-efficiency heating systems, the 14T64 handles both high and low-fire stages, providing accurate differential pressure sensing to prevent rollout or improper combustion. This Lennox HVAC replacement part is built to withstand high-duty cycles, maintaining set-point accuracy across a wide range of operating temperatures. When diagnosing pressure switch codes or inducer failures, utilizing this genuine factory component ensures electrical compatibility and mounting alignment with original equipment specifications.

Key Benefits

• OEM Compatibility: Direct factory match for legacy part number 103612-04, ensuring exact fitment and terminal alignment.
• Multi-Stage Precision: Specifically calibrated for two-stage operation to support variable heating demands and peak efficiency.
• System Protection: Acts as a primary safety threshold by preventing ignition during obstructed venting or inducer failure.
• Rugged Construction: Encased in a durable housing designed to resist vibration and thermal stress in the furnace cabinet.

Common Questions

Can I use a single-stage switch to replace the 14T64?

No. The 14T64 is a 2-stage pressure switch with specific dual-setting setpoints for high and low-fire cycles. Using a single-stage universal switch will cause the control board to throw a fault code and prevent the furnace from operating correctly.

What are the signs that my Lennox pressure switch has failed?

Common symptoms include the inducer motor running continuously without ignition, or the diagnostic LEDs flashing codes related to "Pressure Switch Open" or "Pressure Switch Stuck Closed."

Is this part field-adjustable?

This is a factory-calibrated component. Calibration should not be adjusted in the field; if the switch is not closing at the specified WC (water column) pressure, it must be replaced to ensure safe equipment operation.

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.