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The Lennox 10G93 Limit Control Rollout Switch is a genuine OEM safety device that monitors your Lennox furnace for flame rollout — a hazardous condition where flames extend outside the burner assembly. When a rollout event is detected, this switch immediately cuts power to the burner to prevent heat exchanger damage and potential fire hazards. Common signs of a failed rollout switch include a furnace that locks out repeatedly or fails to start, and replacing it with this authentic Lennox OEM part ensures proper system protection.