Bradford White Water Heater Error Code 1 flash every sec (green)
Gas Control V2
Gas Control V2: Not an error; indicates main valve is open and main burner is lit.
First step from the service manual
Normal operation. Control will automatically shut main burner off when water temperature reaches setpoint.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
Get the full diagnostic procedure for 1 flash every sec (green).
- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
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What 1 flash every sec (green) means on a Bradford White water heater
On Bradford White water heaters equipped with the Gas Control V2 system, a green LED flashing once every second is a normal operational status indicator. This signal confirms that the gas valve has opened and the main burner is actively firing. It is not a fault code and does not indicate any malfunction within the control system, ignition circuit, or gas delivery components.
The Gas Control V2 is an integrated electronic gas valve that manages ignition sequencing, flame sensing, and temperature regulation. When the stored water temperature drops below the configured setpoint, the control initiates a call for heat, opens the main valve, and lights the burner. The single green flash per second continues throughout the entire heating cycle, giving a technician or homeowner a clear visual confirmation that combustion is occurring inside the unit.
The control will automatically close the main valve once the water temperature reaches the programmed setpoint, at which point the LED pattern will change to reflect standby status. No technician intervention is required during this state. If the light continues flashing indefinitely without the burner shutting off, that could indicate a separate issue such as an out-of-range thermostat setting, a failed high-limit sensor, or significant heat loss from the tank, all of which would warrant further diagnostic investigation.
Source: manufacturer service documentation.
Common causes of 1 flash every sec (green)
- 01
Normal heating cycle in progress
Wiring / connectionThe water temperature dropped below the setpoint and the control opened the main gas valve to fire the burner. This is the expected and correct behavior for this status indicator.
- 02
High hot water demand
Wiring / connectionHeavy usage such as multiple showers or filling a large tub can cause extended burner run times, meaning the green flash may continue longer than usual while the tank recovers.
- 03
Thermostat set to a high temperature
Wiring / connectionIf the setpoint is configured at a higher temperature than typical, the burner will run longer to reach that target, prolonging the duration of the flashing status.
- 04
Significant standby heat loss
Wiring / connectionA unit installed in a very cold environment or with deteriorated tank insulation may cycle the burner more frequently, causing the green flash to appear more often throughout the day.
- 05
Thermostat or sensor issue causing extended run time
Part replacementIf the green flash continues indefinitely and the burner never shuts off, a faulty temperature sensor or Gas Control V2 assembly may be preventing the control from detecting that the setpoint has been reached.
Frequently asked questions about 1 flash every sec (green)
What does 1 flash every sec (green) mean on a Bradford White water_heater?
Do I need to fix anything when I see this green flashing light?
Is it safe to use hot water while this light is flashing?
How much does it cost to repair a Bradford White water heater showing this green flash?
Will resetting the control clear this green flashing light?
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