Lennox 69W56 Pressure Switch

The Lennox 69W56 Pressure Switch is a critical dual-stage pressure switch engineered for precision airflow monitoring in Lennox high-efficiency gas furnaces. Built to strictly meet OEM specifications (102737-04), this 2-stage furnace pressure switch features factory-calibrated set points of 0.60" W.C. for high stage and 0.25" W.C. for low stage. These precise thresholds ensure that the inducer motor is moving sufficient combustion air before the ignition sequence begins, protecting the system from venting obstructions and heat exchanger failure. With a SPST-N.O. contact configuration and a 5 Amp resistive rating at 24 VAC, this replacement HVAC pressure switch provides reliable electrical switching for multi-stage heating cycles. It is a direct fit for Lennox SL280 and EL280 series units, designed to restore proper differential pressure sensing and prevent common fault codes related to pressure switch stuck open or closed conditions.

• OEM Calibration: Pre-set at 0.25" and 0.60" W.C. to match original factory specifications for Lennox 2-stage furnaces.
• Enhanced System Safety: Monitors furnace pressure differentials to prevent operation during venting blockages or inducer failure.
• Direct Compatibility: Replaces Lennox part 102737-04, fitting seamlessly into SL280UH, SL280DF, and EL280 series cabinets.
• Durable Construction: High-grade sensing diaphragm and contacts designed for the high-cycle demands of residential HVAC systems.

What are the symptoms of a failing Lennox 69W56 switch?
Common signs include the furnace failing to ignite while the inducer is running, or the control board flashing codes for "pressure switch stay open" or "pressure switch stay closed."

Can I use a single-stage switch to replace the 69W56?
No. The Lennox 69W56 is a two-stage switch. Using a single-stage component will prevent the furnace from operating correctly in both low and high-fire modes, leading to system lockouts.

Is this switch compatible with other brands?
While primarily used in Lennox equipment, it also cross-references with certain Armstrong and Ducane 2-stage units. Always verify the 102737-04 part number on the existing switch label.

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.