Lochinvar & A.O. Smith 100112867 Flow Switch

The Lochinvar & A.O. Smith 100112867 is a mission-critical outdoor flow switch engineered to maintain high-precision monitoring of fluid movement within hydronic heating and pool systems. As a direct OEM replacement for obsolete parts 100232493, WTR2041, WTR2041K, and WTR2141, this component ensures seamless system compatibility and prevents dry-fire conditions that lead to heat exchanger failure. For the seasoned technician, this 100112867 flow switch offers a rugged, weather-resistant build designed to withstand specialized outdoor environmental stressors, ensuring the control board receives accurate continuity signals for burner ignition or pump activation.

During HVAC troubleshooting, the 100112867 simplifies the process with a clearly marked directional arrow for precise orientation and standard electrical termination for boiler maintenance. This genuine Lochinvar part is optimized for low-pressure drop and high durability, reducing common failure points like paddle fatigue or signal drift. Whether you are performing a flow switch replacement on a legacy system or upgrading an existing A.O. Smith water heater, this switch provides the industrial-grade reliability required for professional-tier HVACR performance.

• Direct OEM Match: Drops into place as a precise replacement for 100232493 and WTR2041 series, eliminating the need for field modifications.
• Optimized Outdoor Performance: Features a corrosion-resistant finish and high-quality materials to resist moisture ingress and temperature fluctuations.
• Enhanced System Safety: Provides immediate "no flow" circuit interruption to protect commercial boilers and pool heaters from catastrophic overheating.
• Standardized Installation: Utilizes a standard paddle-style sensing mechanism compatible with various outdoor hydronic systems.

Is this switch compatible with older Lochinvar models?
Yes, the 100112867 is the official successor to several discontinued part numbers including WTR2041 and WTR2141. Always verify the part number against your technical manual.

What causes a "No Flow" light when the pump is running?
Usually, this indicates debris in the paddle mechanism, a backwards installation (check the arrow), or excessive scale buildup. If the circuit remains open despite visible flow, the switch likely requires professional replacement.

Can I use this for indoor applications?
While designated as an outdoor flow switch, it is built to higher durability standards than many indoor-only components, but ensure the specifications align with the specific HVAC system requirements.

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.