Lochinvar & A.O. Smith 100110780 Sensor

The Lochinvar and A.O. Smith 100110780 Flammable Vapor Sensor is a critical safety component designed for gas water heater repair and maintenance. As an updated replacement for the legacy 9005968015 and 184952-000 part numbers, this FV sensor kit is engineered to detect combustible concentrations of gasoline or other flammable vapors near the floor. When high vapor levels are detected, the water heater sensor initiates a safety lockout of the gas control valve, preventing ignition and potential fire hazards. This OEM part is specifically calibrated for A.O. Smith technical specifications, ensuring seamless integration with Power Direct Vent (GPD, GPDX) and select residential models. It operates based on precise resistance values—typically reading between 3,000 and 48,000 ohms when functional—and triggers a flammable vapor sensor lockout error (often a 7-blink code) if the circuit is compromised or vapors are present. Professionals should verify the specific unit serial number to ensure correct fitment before installation.

• Direct OEM Replacement: Fully compatible with systems requiring parts 100110780 or 9005968015, ensuring factory-standard safety parameters.
• Enhanced Safety Logic: Reliable detection of flammable vapors provides essential protection for residential garage and basement installations.
• Accurate Diagnostic Resistance: Designed for clear troubleshooting using standard multimeters to confirm sensor integrity versus control board issues.
• Improved System Reliability: Newest updated version addresses common nuisance tripping found in older sensor generations.

How do I know if my 100110780 sensor is bad?
If your gas valve displays a 7-flash error code and there are no actual flammable vapors present, use an ohmmeter to check the sensor. A reading above 1.7 million ohms generally indicates an open circuit, requiring a replacement kit.

Can I reset the water heater after a vapor lockout?
Once the area is thoroughly ventilated and the cause of the vapors is removed, the gas control valve must be manually reset following manufacturer-specific sequences. If the sensor was physically damaged or exposed to liquid, it must be replaced.

Is this sensor compatible with all gas water heaters?
No. This sensor is specifically for A.O. Smith, Lochinvar, State, and American water heaters using the FVIR-compliant power vent or power direct vent systems. Always match the part number to your specific model and series.

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.