Lochinvar & A.O. Smith 100172005 Gas Valve

When the job requires a drop-in replacement for a failed Lochinvar 100172005, you need a component that handles the rigorous demands of commercial condensing systems. This 24V 1/2" Gas Valve is an OEM-spec assembly, essentially the same unit as the VAL3203, engineered specifically for high-efficiency series like the Lochinvar Knight KBN285 and Armor AW285 models. A veteran tech knows that precise manifold gas pressure regulation is non-negotiable for Natural Gas boilers; this valve provides the consistent throughput required to maintain a stable flame signal and prevent common ignition failure codes on the Smart System display. For contractors troubleshooting a GV/Relay Fail or a suspected solenoid coil open circuit, verifying the 24VAC input and testing the resistance at the 2-pin connector is standard procedure before swapping this assembly. This robust gas control valve ensures clean combustion and reliable firing cycles for both residential and commercial hydronic applications, maintaining the system's thermal performance without the risk of non-OEM calibration issues.

Key Benefits for the Contractor:

• Direct OEM Match: Fully replaces the VAL3203 and 100172005, ensuring the mounting geometry and electrical harness connections align perfectly with Knight KBN286 and AW285 units.
• Precise Pressure Regulation: Designed to manage the specific manifold pressure requirements of high-efficiency Natural Gas condensing water heaters.
• Reliable 24V Actuation: The high-grade solenoid coil is built to withstand the frequent cycling of modern modulating-condensing boilers.
• Diagnostic Compatibility: Seamlessly integrates with the boiler's control board to eliminate flame failure lockout issues caused by sticking or faulty valves.

Common Questions from the Field:

Is the 100172005 compatible with LP (Propane) systems?
This specific part number is calibrated for Natural Gas. While some valves are field-convertible with the appropriate manufacturer-approved orifice or spring kit, always verify the boiler's rating plate and the valve's technical data before attempting a conversion.

What should I check if I get a GV Relay Fail code?
First, inspect the black wiring harness connector at the top of the valve for loose pins or corrosion. Next, verify that the control board is outputting 24VAC to the valve during the ignition sequence. If voltage is present but the valve fails to open, a replacement is necessary.

Does this valve include the mounting hardware?
This is the gas valve assembly. We recommend reusing existing mounting bolts or sourcing local thread sealant rated for fuel gas applications during installation.

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.