Lochinvar & A.O. Smith 100109691 Thermostat

The 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 prevent overheating conditions that can lead to catastrophic system failure. When troubleshooting Lochinvar boiler parts or A.O. Smith water heater issues, verifying the calibration of the high-limit switch is essential. This component integrates seamlessly with existing control boards to provide reliable feedback loops, ensuring that gas water heater temperature control remains within specified engineering tolerances. It is built to withstand the high-temperature environments of commercial mechanical rooms, offering the durability needed for heavy-duty cycling and long-term HVAC replacement parts reliability.

• Compatible with a wide range of Lochinvar and A.O. Smith commercial water heater models.
• Critical safety component for LP water heater systems to prevent excessive temperature buildup.
• OEM direct replacement ensures exact fitment and electrical compatibility with factory wiring harnesses.
• Rugged construction designed for industrial thermal cycling requirements.
• Directly improves system safety by acting as a reliable high-limit thermal cutout.

Is the 100109691 thermostat compatible with natural gas units?
This specific part is designated for LP (Liquid Propane) configurations. Always verify your specific model's manifold pressure and gas type before installation.

What are the symptoms of a failing high-limit thermostat?
Common signs include the burner failing to ignite, frequent system tripping, or the water heater shutting down before reaching the set point on the primary control.

How do I verify if this fits my A.O. Smith water heater?
Check your unit's data plate. This 100109691 thermostat is a standard replacement for several series, but cross-referencing your serial number ensures the correct thermal range is applied.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.