Lochinvar & A.O. Smith 100108716 Gas Valve

The Lochinvar & A.O. Smith 100108716 Gas Valve is a critical OEM replacement part designed for high-efficiency liquid propane (LP) residential water heaters and heating systems. Engineered for precise fuel regulation, this 24V gas control valve is factory-calibrated to maintain a 10" WC (Water Column) outlet pressure, ensuring optimal combustion and thermal efficiency. Featuring a standard 1/2" NPT gas connection, this combination gas valve integrates an internal microprocessor that provides advanced HVAC troubleshooting capabilities via an LED status indicator, allowing technicians to diagnose ignition or flame sensing issues rapidly.

Built for durability in demanding environments, the 100108716 gas control is the direct replacement for part number 9002123005. Its robust construction minimizes mechanical wear, while the self-powered circuitry utilizes a thermopile to manage the main burner and pilot assembly without an external power source for the control logic. When performing a gas valve replacement, always verify manifold pressure with a manometer and ensure the thermal switch is reset to prevent nuisance lockouts. This part is a site-specific component and is not universal; check your specific model and serial number to confirm compatibility with your current Lochinvar or A.O. Smith unit.

• OEM Precision: Genuine Lochinvar/A.O. Smith gas valve ensures exact fitment and restores original equipment performance.
• Advanced Diagnostics: Integrated LED status light simplifies HVAC system diagnostics by flashing specific fault codes.
• Propane Optimized: Factory-set for 10" WC LP applications, eliminating the need for complex field conversions.
• Thermostat Compatibility: High-sensitivity 24V coil design works seamlessly with standard residential control circuits.

How do I know if the 100108716 valve is faulty?
If your pilot won't stay lit after the 60-90 second warmup or the status light indicates an internal failure, check the millivolt output of the thermopile. If the thermopile is above 350mV and all connections are secure, the internal solenoid or circuit board has likely failed.

Can I use this valve for Natural Gas?
No, this specific model is calibrated for Propane (LP) at 10" WC. Using it for Natural Gas without a certified conversion kit (if applicable) can lead to hazardous over-firing and equipment damage.

Why is my status light not flashing?
The status light requires the pilot to be lit so the thermopile can generate power. If the pilot is lit but there is no flash, check the thermal switch for a trip or inspect the wiring harness for continuity.

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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.