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The Lennox 10G90 (OEM part number 102610-02) is a genuine Lennox OEM control limit switch rated at 180°F, designed to interrupt the burner circuit when furnace temperatures exceed safe levels, protecting critical components from heat damage. Symptoms of a failed limit switch include a Lennox furnace that continuously cycles the blower, refuses to ignite, or experiences frequent high-limit lockouts. This direct OEM replacement ensures accurate temperature calibration and a precise fit for compatible Lennox furnace applications.