Lochinvar & A.O. Smith 100262939 Gas Valve

The Lochinvar & A.O. Smith 100262939 Gas Valve is a critical OEM replacement part engineered for high-recovery natural gas water heaters, specifically the GS and GT series. As a veteran technician knows, this N3 natural gas control valve features a 2-inch cavity (CAV) and is designed for precise 4.0" WC outlet pressure manometric regulation. This Honeywell WV8840B1158 model serves as a combined gas control thermostat, ensuring the burner receives a consistent fuel supply for optimal combustion efficiency. Whether you are servicing a Lochinvar Knight boiler or an A.O. Smith GCR series residential unit, maintaining the pilot light and thermopile assembly integrity is vital. The 1/2" PSI max inlet rating provides the necessary safety overhead for standard residential utility feeds. This direct replacement gas valve is essential for resolving ignition failure or temperature regulation issues in HVACR systems, utilizing a standard 24V AC combination-step opening mechanism for reliable performance.

• Broad Compatibility: Drop-in OEM part for A.O. Smith GCR30, GCR40, GCR50, and Lochinvar GSN/GTN series.
• Precision Regulation: Factory-set for natural gas with 4.0" W.C. output, eliminating the need for complex field adjustments.
• Service Consistency: Replaces common part numbers 100082519 and 324711-001, reducing truck stock complexity.
• Diagnostics Ready: Compatible with standard HVAC service manuals for millivolt testing and status light code troubleshooting.

How do I troubleshoot a flashing status light on this valve?
The status light indicates specific internal diagnostics. A common single flash usually means the pilot is lit and the system is in standby. For other codes, verify the thermopile millivolt output is above 350mV and check for thermal switch continuity.

Can this natural gas valve be converted to Liquid Propane (LP)?
No. This specific 100262939 model is designed for Natural Gas ONLY. Attempting to convert or use this with LP can lead to dangerous manifold pressures and combustion failure.

What should I check if the main burner fails to ignite but the pilot remains lit?
Verify 24V AC at the main valve solenoid connections. If voltage is present and the inlet gas pressure is within the 1/2" PSI limit but the valve does not open, the internal solenoid or regulator assembly may be seized.

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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.