Lochinvar & A.O. Smith 100210087 Valve

As a veteran tech, you know that a failing Natural Gas Control Valve is a top cause for ignition failure and erratic burner cycles. The Lochinvar & A.O. Smith 100210087 Valve is a genuine OEM replacement part engineered for specific high-efficiency residential and commercial water heaters, including many State and American Water Heater models. This direct-acting gas valve regulates the manifold pressure and gas flow to the burner based on signals from the control board, ensuring consistent combustion and preventing dangerous over-firing or flame loss.

The 100210087 features a compact valve body designed for tight cabinets, making it a reliable HVAC repair part for contractors handling 250 and 400 series units. Proper gas valve troubleshooting often points to this component when natural gas water heaters fail to maintain set-point temperatures. When installing, always verify your inlet and manifold pressures with a calibrated manometer to ensure this A.O. Smith gas control is dialed into factory specs for peak efficiency and safety.

• OEM Precision: Eliminates the compatibility headaches common with universal or aftermarket gas control valves.
• Optimized Flow Control: Maintains steady natural gas delivery for reliable ignition and stable flame signals.
• Direct Fitment: Designed for an exact match on Lochinvar and A.O. Smith commercial and residential models.
• System Security: Prevents gas leakage and protects the heat exchanger from excessive thermal stress.

Is the 100210087 compatible with Propane (LP) systems?
No, this specific part number is calibrated for Natural Gas only. Attempting to use this on an LP system without a verified conversion kit is a safety hazard.

What are the signs this valve needs a swap?
Technicians typically look for a "No Flame Detected" lockout, erratic clicking from the solenoid, or if the gas valve fails to open during the ignition sequence despite receiving 24V from the control.

Do I need to calibrate this out of the box?
While OEM gas valves are factory set, a pro should always perform a combustion analysis and check the manifold pressure during high-fire to ensure the unit is running within the manufacturer’s specified range.

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.