This industry-standard code indicates the switch opens at 170°F (L170) and has a 50-degree differential

Key Benefits OEM Compatibility: Specifically designed to match the electrical and flow requirements of Utica and Dunkirk boiler chassis

capable of driving multiple valves like the M411

Common Questions Is the 100208486 interchangeable with RLY2044

Lead-Free Certified: Meets all current plumbing standards for potable water applications

Lochinvar & A.O. Smith 100112429 Switch R-407A This industry-standard code indicates theThe Lochinvar & A. O. Smith 100112429 Blocked Flue Switch is a critical safety component designed for high efficiency water heaters and commercial boilers. As a normally closed thermal switch, it monitors the venting system for atmospheric pressure imbalances or physical obstructions that could lead to dangerous carbon monoxide accumulation. Engineered for precision, this OEM replacement part triggers a system shutdown if it detects flue gas backup,