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The Lennox 60M95 (60M9501) is an OEM-genuine limit switch that monitors your Lennox furnace's internal temperature and interrupts burner operation if unsafe heat levels are detected, guarding against heat exchanger damage and potential fire hazards. Symptoms of a defective limit switch include the furnace shutting off before reaching the set temperature, continuous blower operation, or a lit limit-fault indicator on the control board. Replace with this exact OEM part for a guaranteed fit and long-lasting, dependable protection.