System Protection: Prevents furnace operation during flue obstructions

Common Questions How do I change the damper action on this controller

For technicians performing pool heater repair

confirm if your specific application requires a new well or gasket separately

and packaged equipment

Lochinvar & A.O. Smith 100109691 Thermostat 318423-701 System Protection: Prevents furnace operationThe Lochinvar & A. O. Smith 100109691 Thermostat is a high limit LP thermostat engineered for precise temperature regulation in commercial and residential water heaters. This OEM replacement part (formerly part number 100109691) is critical for maintaining safety protocols and operational efficiency within the combustion chamber. Designed specifically for liquid propane applications, this surface mount thermostat ensures accurate thermal sensing to