Lochinvar & A.O. Smith 100173748 Cut-Off

The Lochinvar & A.O. Smith 100173748 is a critical Low Water Cut-Off (LWCO) safety control designed to protect hydronic and steam systems from dry-fire conditions. Functioning as an Auto Reset sensor, this component continuously monitors the boiler’s water level and breaks the 24V control circuit to the burner if a low-water threshold is detected. This specific HVAC replacement part is essential for maintaining operational safety in residential and commercial boilers, featuring OEM compatibility with A.O. Smith and Lochinvar CBL, CHL, and CBN series units. Technical specifications confirm that the 100173748 is identical to WTR30001, offering a direct-fit solution for technicians servicing modern heating plants.

Integrated as a primary safety limit, this boiler safety control ensures that the system will automatically resumed operation once the appropriate water level is replenished, reducing unnecessary downtime while preventing catastrophic heat exchanger failure. By prioritizing system dependability and mitigating the risk of expensive repairs, this genuine OEM part provides the reliability required by veteran contractors. Its compact 3x3x3 inch profile and lightweight design allow for seamless integration into existing control loops where a secondary or primary low water cutoff is mandated by local codes.

• Automatic Reset Functionality: Restores system operation immediately after water levels return to safe parameters without manual intervention.
• Broad Boiler Compatibility: Engineered specifically for Lochinvar and A.O. Smith systems, ensuring 100173748 boiler part precision.
• Dry-Fire Protection: Safeguards the heat exchanger against overheating and metal warping during sudden fluid loss.
• Direct Interchangeability: Fully replaces WTR30001, simplifying inventory and field replacement.

• Is the 100173748 a direct replacement for the WTR30001? Yes, these part numbers are technically identical and serve the same function in Lochinvar and A.O. Smith equipment.
• Does this LWCO require a manual reset after a trip? No, this model is an auto-reset type. If your local code requires a manual reset for the primary safety, verify your application requirements.
• How do I troubleshoot a suspected LWCO failure? Check for 24V power at the control. If the water level is sufficient but the burner remains locked out, ensure the probe is free of scale or sediment buildup.

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.