Lochinvar & A.O. Smith 100110615 Switch

The Lochinvar & A.O. Smith 100110615 Blower Prover Switch is a critical safety component designed for high-efficiency gas-fired boilers and water heaters. As a veteran-grade air sensing switch, this part identifies positive pressure to ensure the inducer motor is moving sufficient combustion air before the ignition sequence initiates. This OEM replacement switch (part number 100110615) is the updated version for the 9005726215 and functions as a normally open (N.O.) contact that closes upon reaching its specific activation pressure, typically around 0.75” WC for many compatible 120-250 models. Failures in this component often trigger "Blower Prover Open" error codes, preventing the burner from firing. For field diagnostics, technicians should verify continuity across the terminals and check the sensing tube for blockages or cracks that could impede the pressure switch from proving inducer airflow. This genuine HVAC replacement part ensures your heating equipment maintains factory-spec safety protocols and operational efficiency.

• Precise Airflow Detection: Modern diaphragm technology ensures the blower prover switch accurately monitors flue gas venting.
• OEM Compatibility: Specifically engineered for Lochinvar boilers and A.O. Smith water heaters, including Ultra High Efficiency and Legend series units.
• System Protection: Prevents hazardous gas buildup by inhibiting ignition if combustion air pressure is insufficient.
• Durable Construction: Built to withstand the rhythmic thermal cycling and pressure fluctuations common in commercial and residential HVAC systems.

• How do I troubleshoot a 'Blower Prover Open' error? Check for 120VAC at the blower; if the blower runs but the code persists, inspect the sensing tube for moisture or debris and test the 100110615 switch for closure using a manometer.
• Can I use a universal pressure switch instead of this model? It is not recommended. This OEM part is calibrated to specific inch water column (WC) settings required for the unit's safety logic.
• Is the 100110615 compatible with older 9005726215 units? Yes, this is the official manufacturer-designated replacement air switch for that legacy part number.

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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.