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The Lennox Y5415 is an OEM rollout switch designed specifically for Lennox gas-fired induced draft hot water boilers, providing critical protection by detecting abnormal flame rollout conditions and shutting down the burner to prevent heat exchanger damage or fire hazard. If your boiler is experiencing nuisance lockouts, failing to ignite, or showing error codes related to flame rollout, a faulty rollout switch is often the cause. This genuine Lennox OEM replacement part ensures proper fit and function, maintaining the safety and efficiency of your Lennox boiler system.