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The Lennox 36N03 is a genuine OEM ECM (Electronically Commutated Motor) Blower Motor Module that governs the variable-speed operation of the blower in compatible Lennox furnaces and air handlers. Symptoms of a failing ECM module include the blower not starting, erratic fan speeds, reduced airflow, error codes on the control board, and poor heating or cooling performance throughout the home. This authentic Lennox OEM replacement module restores precise motor control, energy-efficient operation, and consistent comfort to your system.