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The Lennox Y8150 is a genuine OEM air sensing pressure switch rated at 0.5" water column (WC), designed to verify proper airflow and inducer operation in compatible Lennox furnaces before allowing the ignition sequence to proceed. Symptoms of a failed air sensing switch include the furnace not igniting, a pressure switch fault or error code on the control board, or the inducer motor running without the furnace advancing through its startup cycle. This factory-original replacement switch ensures your Lennox furnace operates safely by confirming adequate combustion airflow before each heating cycle.