Lochinvar & A.O. Smith 100327067 Gas Valve

As a seasoned technician, you know that a failing Lochinvar 100327067 gas valve is often the culprit behind "Ignition Fault" or "Flame Failure" codes on high-efficiency boilers and water heaters. This 24V AC combination-step opening gas valve is the direct replacement for 100171535 and is engineered to maintain precise manifold pressure for optimal combustion. Whether you are servicing an A.O. Smith commercial water heater or a Lochinvar Knight boiler, this OEM component ensures the system operates within its specified 3.5" W.C. natural gas factory setting (adjustable from 3.0" to 5.0" W.C.).

The 100327067 gas valve assembly features a robust design capable of handling a maximum inlet pressure of 14" W.C. and includes integrated pressure taps for both supply and manifold readings. This part is critical for HVAC gas valve replacement in systems that require negative pressure sensing via the blower to allow gas flow. When troubleshooting, verify 24V signal at the valve; if power is present but the internal solenoid fails to open, this unit is the required technical solution to restore hot water heater gas control and system reliability.

• Direct OEM Compatibility: Seamlessly replaces legacy part number 100171535 without the need for additional mounting kits.
• Precise Gas Regulation: Pre-set for natural gas with an adjustable regulator to dial in specific BTU requirements.
• Service-Friendly Design: Features accessible pressure taps for quick manometer connections during startup and commissioning.
• Wide Application Range: Compatible with various Lochinvar and A.O. Smith condensing boilers and commercial heaters.

Is the 100327067 compatible with Propane (LP) systems?
While typically factory-set for natural gas, this valve can often be converted for LP applications using a manufacturer-approved orifice kit and regulator adjustment. Always verify the rating plate on the equipment before installation.

What are the symptoms of a faulty 100171535 or 100327067 valve?
Technicians typically find that the blower is running and the igniter is glowing (or sparking), but the manifold pressure remains at zero, indicating the valve is not opening despite receiving its 24V signal.

Does this include the flange or mounting hardware?
This is the standalone gas valve assembly. It is designed to thread into existing piping; always use a backup wrench when tightening connections to prevent damage to the valve body.

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.