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The genuine OEM Lennox 25W69 Pressure Switch is a critical safety device that confirms proper draft before your Lennox furnace lights. Sensing the vacuum created by the inducer motor, it verifies that the venting is clear and combustion gases are being safely exhausted. Only when the correct negative pressure is proven does the switch close and allow the ignition sequence to proceed.
Common failure symptoms: A faulty 25W69 often shows up as a furnace that won't start, a pressure-switch fault code, the inducer running continuously without ignition, or intermittent lockouts. A switch stuck open blocks ignition entirely, while one stuck closed defeats a key safety check. Blocked vents and cracked hoses can mimic these symptoms, so verify the tubing as well.
Why OEM matters: Pressure switches are rated to a precise trip point (in inches of water column) matched to your Lennox model's inducer and venting. An incorrect aftermarket switch can trip too early, too late, or fail to protect against dangerous venting conditions. The OEM 25W69 guarantees the exact set point and hose fittings your equipment requires. Ships same day.