Lochinvar & A.O. Smith 100208173 Limit Switch

The Lochinvar & A.O. Smith 100208173 Limit Switch is a critical safety component designed for high-performance water heaters and boilers. This 200F CO auto limit switch operates as a fixed-temperature safety control, ensuring the system shuts down if internal temperatures exceed the 200°F threshold. Engineered for precise thermal response, this HLC2510K replacement limit switch is identical to the HLC2510 model, providing a direct-fit solution for contractors maintaining commercial and residential hydronic systems. As a high-limit thermostat switch, it prevents overheating conditions that could lead to vessel damage or system failure. This water heater safety switch features a compact footprint for easy integration into the control string, maintaining the OEM thermal protection standards required by Lochinvar and A.O. Smith. Relying on accurate limit switch troubleshooting and timely replacement ensures consistent uptime and prevents intermittent lockouts in demanding HVACR environments.

• Direct OEM Compatibility: Replaces cross-referenced parts 100208173, HLC2510, and HLC2510K without requiring wiring modifications.
• Automatic Reset Functionality: Features a close-on-rise (CO) configuration that resets automatically once temperatures drop below the safety differential.
• Precise Thermal Calibration: Factory-set at 200 degrees Fahrenheit to ensure rigorous adherence to system safety parameters.
• Durable Construction: Built to withstand the high-ambient conditions of modern boiler cabinets and water heater burner assemblies.

Is the 100208173 limit switch a manual or automatic reset?
This specific model is an automatic reset limit switch. It will automatically re-engage the circuit once the sensed temperature falls back within the safe operating range, unlike manual reset versions that require a technician to physically depress a button after a trip event.

What are the symptoms of a failing HLC2510K limit switch?
Common signs include the system failing to ignite despite a call for heat, or the burner shutting down prematurely. If the switch remains open despite the water being below 200°F, the internal bimetal disc may be fatigued, requiring a full replacement to restore safe operation.

Can I use this switch in non-Lochinvar equipment?
While this is a primary A.O. Smith 100208173 part, it is compatible with any system requiring an HLC2510 type switch with the same temperature rating and mounting profile. Always verify the specific temperature set point on the existing switch before installation.

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.