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The Lennox 22J87 Asurity Condensate Safety Overflow Switch is a genuine OEM replacement designed to monitor condensate drain pan levels and shut down your Lennox system before overflow damage occurs. A faulty or failed condensate safety switch may allow drain pan overflow, leading to water damage, mold growth, or system corrosion, or it may cause nuisance shutdowns if it malfunctions in a closed position. Replacing your failed switch with the factory-spec Lennox 22J87 ensures your system responds accurately to condensate levels and maintains safe, efficient operation.