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The Lennox 97J65 (OEM part 97J6501) is a genuine Lennox limit switch engineered to monitor heat exchanger temperatures and shut down burner operation if unsafe temperature levels are detected. Common symptoms of a failed limit switch include a furnace that won't stay on, repeatedly trips, or causes the blower to run continuously without producing heat. This OEM Lennox replacement part restores proper safety control function and is built to exact factory specifications for compatible Lennox furnace models.