the internal mechanism snaps to the "Normally Closed" position (C to NC)

or internal board failure

maintaining tight tolerances required for safe residential and commercial heating cycles

Durable Construction: Built with high-quality materials to withstand high temperatures and prevent internal manifold leaks

Lennox 47L19 Limit Switch 321894-706 the internal mechanism snaps toThe Lennox 47L19 Limit Switch is a critical OEM replacement part designed for precise thermal regulation in residential and commercial furnaces. As an auto reset limit switch, this 36T series disc style component operates on a normally closed circuit, ensuring the burner assembly remains functional only within safe operating parameters. When the internal plenum temperature reaches the 185F high limit threshold, the switch opens, breaking the circuit