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The Lennox 71G15 (part number 71G1501) is a genuine OEM yellow manual reset switch that must be manually reset after a safety limit event occurs in your Lennox HVAC system, providing an added layer of protection against repeated unsafe operation. Symptoms of a failed manual reset switch include the system refusing to restart after a trip or the switch failing to hold after being reset. This authentic Lennox component ensures reliable safety performance and a precise fit in compatible Lennox equipment.