Resideo WT8840A1500 Gas Control

The Resideo WT8840A1500 Gas Control is the industry-standard trade replacement for the Honeywell WV8840A1050 and WV8840A1051 series. Designed specifically for Bradford White water heaters and AO Smith units with a 2-inch insulation cavity, this natural gas water heater valve features a 1/2" NPT inlet and a 1/2" inverted flare outlet. It operates as a standing pilot gas valve, powered entirely by the 750mV thermopile output, eliminating the need for external 24V wiring. With a factory-set 4" WC pressure regulator and a maximum capacity of 85,000 BTUH, this control ensures precise manifold pressure for atmospheric burners. The integrated NTC thermistor sensor provides accurate temperature monitoring up to 160 degrees, while the resettable emergency temperature cutoff (TCO) at 189°F prevents hazardous overheating. For field service technicians, the diagnostic LED status indicator reduces troubleshooting time by providing clear flash codes for common water heater temperature sensor or pilot assembly issues. Always verify the 87C TCO limit and upright mounting orientation before completing the gas control valve replacement.

• Direct OEM Compatibility: Engineered as a drop-in natural gas gas control for Bradford White 415-52907-02 and AO Smith systems.
• Integrated Diagnostics: The built-in status LED assists in rapid pinpointing of sensor failures or pilot outages.
• Self-Powered Operation: Thermopile-driven design ensures the system functions during power outages without secondary transformers.
• Anti-Scaling Algorithm: Advanced internal logic prevents setpoint overshoot, enhancing user safety and system longevity.
• Simplified Inventory: Replaces multiple legacy WV8840 models, making it a essential truck-stock item for HVACR contractors.

• How do I resolve a 5-flash code on this gas control? A 5-flash LED sequence typically indicates a water heater temperature sensor or thermowell failure requiring a probe inspection or unit replacement.
• Can I use the WT8840A1500 for LP conversions? No, this is a dedicated natural gas water heater valve and is not designed for Liquid Propane conversion.
• What is the correct mounting position? To ensure proper regulator function and safety, this control must be installed in the strictly upright position.

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.