Lochinvar & A.O. Smith 100110176 Limit Switch

The Lochinvar & A.O. Smith 100110176 Limit Switch is a critical safety component designed for high-performance commercial and residential water heating systems. As a fixed high limit control, this SPST (Single Pole, Single Throw) device features a manual reset mechanism, ensuring that the system remains offline for professional inspection should temperatures exceed the safety threshold. Engineered for precision, the 100110176 limit control is calibrated with a non-adjustable 200°F cutout, providing a fail-safe against overheating in the heat exchanger or storage tank. Utilizing a remote bulb sensor, it provides accurate immersion temperature monitoring, which is vital for maintaining the structural integrity of the unit. This genuine OEM replacement part is compatible with various Lochinvar, A.O. Smith, State, and American Water Heater models. For technicians, this manual reset high limit is a standard truck-stock item for resolving lockout codes related to thermal over-limit scenarios, ensuring the system operates within its engineered parameters.

• Precision Thermal Protection: Set to a fixed 200°F cutout to prevent catastrophic overheating and protect the tank lining.
• Manual Reset Security: The manual reset switch prevents the burner from firing automatically after a trip, forcing a necessary safety check of the airflow or water recovery.
• OEM Compatibility: Replaces factory-installed Lochinvar and A.O. Smith limit switches to ensure original equipment specifications are met.
• Durable SPST Design: Simple single-pole, single-throw electrical action provides a reliable break in the pilot or gas valve circuit.
• Remote Bulb Sensing: Features a high-sensitivity remote bulb for deep immersion, ensuring the most accurate water temperature readings.

• What causes this limit switch to trip frequently? Often, a trip is caused by excessive sediment buildup in the tank, a malfunctioning thermostat that over-fires, or restricted water flow through the heat exchanger.
• Can I bypass the 100110176 to test the system? Bypassing a fixed high limit is extremely dangerous and strictly against safety protocols; use a multimeter to check for continuity across the terminals when the system is cool.
• Is this an automatic or manual reset part? This specific model is a manual reset high limit, meaning you must physically depress the button to restore the circuit after the temperature drops below the trip point.
• Does this work for both gas and electric models? While primarily found on A.O. Smith gas water heaters and Lochinvar boilers, always verify the specific part number in the manufacturer's service manual.

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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.