OEM Lennox Pressure Switch — 80K25

The genuine OEM Lennox 80K25 pressure switch is a critical safety control in your Lennox gas furnace. It monitors the negative pressure created by the draft inducer motor to confirm that combustion gases are venting properly before the ignition sequence begins. If adequate airflow isn't detected, the switch prevents the furnace from firing — protecting your home from unsafe operation.

Common failure symptoms include:

• Furnace ignites briefly then shuts down (short cycling)
• Control board flashes a pressure switch fault code
• Blower or inducer runs but the burners never light
• Stuck-open or stuck-closed switch readings during diagnostics

A worn diaphragm, cracked hose port, or contamination inside the switch can all cause nuisance lockouts and no-heat calls. Installing the exact Lennox 80K25 restores reliable pressure sensing at the factory-calibrated set point.

Why OEM matters: Lennox furnaces are engineered around precise pressure thresholds tuned to each heat exchanger and inducer combination. Aftermarket switches often trip at the wrong pressure, leading to intermittent faults or bypassed safety protection. The OEM 80K25 guarantees the correct calibration, fit, and electrical connection for dependable, code-compliant performance.