Resideo WT8840A1000 Gas Control
The Resideo WT8840A1000 is a high-performance natural gas water heater control designed for direct trade replacement of the Honeywell WV8840 series. Engineered for A.O. Smith and Bradford White standing pilot units, this valve is optimized for tanks with 1-inch cavity insulation. It features a 1/2" NPT inlet and a 1/2" inverted flare outlet, managing a 4" W.C. pressure regulator setting for consistent manifold pressure. The integrated thermopile-powered design eliminates the need for external electricity, utilizing the pilot flame to power the diagnostic LED status indicator and internal NTC thermistor. This control is rated for a maximum temperature of 160 degrees Fahrenheit and includes a resettable thermal cut-off for enhanced safety during high-limit events. For technicians, the upright mounting orientation and accessible top-side wiring facilitate a clean, professional install on common residential 222-47463-01 series applications.
Key Benefits- Universal Compatibility: Serves as a direct-fit replacement for Honeywell WV8840A1000, WV8840A1001, and OEM parts used in Bradford White and AO Smith systems.
- Diagnostic LED: Reduces troubleshooting time by providing clear flash codes for sensor failure, low voltage, or high-limit trips.
- Enhanced Safety: Built-in NTC temperature sensor and internal TCO protect against scalding and overheating.
- Self-Powered Logic: Operates entirely via millivolt power from a standard thermopile, ensuring hot water availability during power outages.
- Precise Pressure Regulation: Features a 4" WC factory setting to maintain stable burner combustion and efficiency.
What does it mean if the LED is not blinking?
If the status light is dark, verify the pilot is lit and heating the thermopile. Ensure all wiring harness connections are secure; the valve requires a minimum millivolt signal from the thermopile to power the control board.
Will this valve work for Ultra-Low NOx (ULN) models?
The WT8840A1000 is designed for standard standing pilot water heaters. For Ultra-Low NOx applications, check for part numbers starting with WT8860 to ensure proper air-fuel ratios and regulator settings.
Can I use this gas control for a 2-inch insulation tank?
This specific model features a 1-inch immersion well (spud). For tanks with 2-inch insulation, a longer probe model like the WT8840A1500 is typically required to reach the internal tank water effectively.
This item is not eligible for free shipping.
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.
Resideo WT8840A1000 Gas Control
The Resideo WT8840A1000 is a high-performance natural gas water heater control designed for direct trade replacement of the Honeywell WV8840 series. Engineered for A.O. Smith and Bradford White standing pilot units, this valve is optimized for tanks with 1-inch cavity insulation. It features a 1/2" NPT inlet and a 1/2" inverted flare outlet, managing a 4" W.C. pressure regulator setting for consistent manifold pressure. The integrated thermopile-powered design eliminates the need for external electricity, utilizing the pilot flame to power the diagnostic LED status indicator and internal NTC thermistor. This control is rated for a maximum temperature of 160 degrees Fahrenheit and includes a resettable thermal cut-off for enhanced safety during high-limit events. For technicians, the upright mounting orientation and accessible top-side wiring facilitate a clean, professional install on common residential 222-47463-01 series applications.
Key Benefits- Universal Compatibility: Serves as a direct-fit replacement for Honeywell WV8840A1000, WV8840A1001, and OEM parts used in Bradford White and AO Smith systems.
- Diagnostic LED: Reduces troubleshooting time by providing clear flash codes for sensor failure, low voltage, or high-limit trips.
- Enhanced Safety: Built-in NTC temperature sensor and internal TCO protect against scalding and overheating.
- Self-Powered Logic: Operates entirely via millivolt power from a standard thermopile, ensuring hot water availability during power outages.
- Precise Pressure Regulation: Features a 4" WC factory setting to maintain stable burner combustion and efficiency.
What does it mean if the LED is not blinking?
If the status light is dark, verify the pilot is lit and heating the thermopile. Ensure all wiring harness connections are secure; the valve requires a minimum millivolt signal from the thermopile to power the control board.
Will this valve work for Ultra-Low NOx (ULN) models?
The WT8840A1000 is designed for standard standing pilot water heaters. For Ultra-Low NOx applications, check for part numbers starting with WT8860 to ensure proper air-fuel ratios and regulator settings.
Can I use this gas control for a 2-inch insulation tank?
This specific model features a 1-inch immersion well (spud). For tanks with 2-inch insulation, a longer probe model like the WT8840A1500 is typically required to reach the internal tank water effectively.
This item is not eligible for free shipping.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Resideo WT8840A1000 is a high-performance natural gas water heater control designed for direct trade replacement of the Honeywell WV8840 series. Engineered for A.O. Smith and Bradford White standing pilot units, this valve is optimized for tanks with 1-inch cavity insulation. It features a 1/2" NPT inlet and a 1/2" inverted flare outlet, managing a 4" W.C. pressure regulator setting for consistent manifold pressure. The integrated thermopile-powered design eliminates the need for external electricity, utilizing the pilot flame to power the diagnostic LED status indicator and internal NTC thermistor. This control is rated for a maximum temperature of 160 degrees Fahrenheit and includes a resettable thermal cut-off for enhanced safety during high-limit events. For technicians, the upright mounting orientation and accessible top-side wiring facilitate a clean, professional install on common residential 222-47463-01 series applications.
Key Benefits- Universal Compatibility: Serves as a direct-fit replacement for Honeywell WV8840A1000, WV8840A1001, and OEM parts used in Bradford White and AO Smith systems.
- Diagnostic LED: Reduces troubleshooting time by providing clear flash codes for sensor failure, low voltage, or high-limit trips.
- Enhanced Safety: Built-in NTC temperature sensor and internal TCO protect against scalding and overheating.
- Self-Powered Logic: Operates entirely via millivolt power from a standard thermopile, ensuring hot water availability during power outages.
- Precise Pressure Regulation: Features a 4" WC factory setting to maintain stable burner combustion and efficiency.
What does it mean if the LED is not blinking?
If the status light is dark, verify the pilot is lit and heating the thermopile. Ensure all wiring harness connections are secure; the valve requires a minimum millivolt signal from the thermopile to power the control board.
Will this valve work for Ultra-Low NOx (ULN) models?
The WT8840A1000 is designed for standard standing pilot water heaters. For Ultra-Low NOx applications, check for part numbers starting with WT8860 to ensure proper air-fuel ratios and regulator settings.
Can I use this gas control for a 2-inch insulation tank?
This specific model features a 1-inch immersion well (spud). For tanks with 2-inch insulation, a longer probe model like the WT8840A1500 is typically required to reach the internal tank water effectively.
This item is not eligible for free shipping.
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.
