Lochinvar & A.O. Smith 100110096 Limit Switch

In the field, a tripped Lochinvar & A.O. Smith 100110096 Manual Reset Limit Switch is a clear signal of an over-temperature condition that requires immediate professional attention. This OEM high limit safety switch is engineered to monitor heat exchanger and combustion chamber temperatures, providing a critical fail-safe by opening the electrical circuit when safety temperature thresholds are exceeded. Designed for high-output Lochinvar boilers and A.O. Smith water heaters, this thermal switch features a manual reset button that prevents the system from automatically cycling back on, ensuring a technician can diagnose root causes like restricted water flow, scale buildup, or dry fire conditions. This replacement limit switch maintains the precise fixed-point calibration needed to protect expensive internal components from catastrophic thermal stress. When you're dealing with a residential or commercial appliance that won't stay lit or shows a limit circuit open code, installing this genuine 100110096 switch is the standard protocol for restoring safe and reliable operation to the service unit.

• OEM Reliability: Direct replacement for Lochinvar and A.O. Smith parts, ensuring 100% compatibility with factory control boards and wiring harnesses.
• Critical Safety Logic: The manual reset design prevents hazardous auto-restarts, forcing a necessary system inspection after a trip.
• High-Precision Calibration: Factory-set to accurately detect over-temperature events before they cause heat exchanger damage.
• Durable Construction: Built to withstand the high-ambient environments found inside commercial boiler cabinets.

Common Questions

Why does this manual reset limit switch keep tripping on my boiler?
Repeated tripping usually points to a water flow issue, such as a failing circulator pump, air trapped in the heat exchanger, or significant lime and scale accumulation. It can also be caused by a blocked flue or insufficient combustion air in gas-fired units.

Can I bypass the 100110096 switch to get the heat back on?
Negative. Bypassing a high limit safety device creates a severe risk of fire or boiler explosion. If the switch is open, the system has exceeded its safe operating temperature and must be diagnosed by a qualified HVAC technician.

How do I know if the limit switch is faulty or if it’s doing its job?
Use a multimeter to check for continuity across the terminals. If the system is cool and the reset button is depressed but you still have an open circuit, the thermal switch has failed and requires replacement.

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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.