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Error code reference

Bradford White Water Heater Error Code 1 flash every second (green)

Main valve is open and main burner is lit; thermostat is calling for heat and water heater is operating…

Bradford White codesBradford White water heater codes

Main valve is open and main burner is lit; thermostat is calling for heat and water heater is operating normally.

First step from the service manual

Normal operation. Control will automatically shut main burner off when setpoint temperature is reached.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What 1 flash every second (green) means on a Bradford White water heater

The 1 flash per second green LED pattern on a Bradford White water heater is a normal operating status indicator, not an error or fault code. This signal confirms that the electronic gas valve (main valve) is energized and open, the main burner is actively lit, and the control board is responding to a call for heat from the thermostat. The control system continuously monitors water temperature and activates the gas valve circuit when the stored water temperature drops below the configured setpoint.

During this normal heating cycle, the control board sends the appropriate voltage signal to open the main gas valve, allowing gas to flow to the main burner. The ignition system has already confirmed a flame is present, and the system is in full heating mode. The green flash rate of once per second is the Bradford White control's designated indicator for active burner operation, distinguishing it from standby mode or fault conditions which use different flash patterns or colors.

This status will continue as long as the water temperature remains below the setpoint. Once the stored water reaches the target temperature, the control board will de-energize the main gas valve, closing it and extinguishing the main burner. The LED pattern will then shift to reflect standby mode. No technician intervention is required when this pattern is observed. It simply confirms the heater is cycling normally through a heating demand.

Source: manufacturer service documentation.

Common causes of 1 flash every second (green)

  1. 01

    Normal heating cycle after hot water use

    Wiring / connection

    When hot water is drawn from the tank, cold water enters and the temperature drops below the setpoint, triggering the thermostat to call for heat. This is the most common and expected reason for this indicator.

  2. 02

    Initial startup after installation or power restoration

    Wiring / connection

    When the heater is first powered on or restored after an outage, the tank water is cold and the control immediately initiates a heating cycle. This can cause the burner to run for an extended period until the full tank volume reaches setpoint.

  3. 03

    High hot water demand extending the heating cycle

    Wiring / connection

    Heavy or continuous hot water usage can cause the heater to run longer than usual as it works to keep up with demand. This is normal operation but may indicate the unit is undersized for the household load.

  4. 04

    Setpoint configured higher than default

    Wiring / connection

    If the thermostat setpoint has been raised significantly, the heater will run longer heating cycles to reach and maintain the higher temperature. Check the temperature setting on the control if heating cycles seem unusually long.

See the test procedure for each cause

Frequently asked questions about 1 flash every second (green)

What does 1 flash every second (green) mean on a Bradford White water_heater?
This pattern means the water heater is operating normally. The main gas valve is open, the main burner is lit, and the thermostat is calling for heat. The control board will automatically shut the burner off once the water reaches the set temperature. No action is required.
Do I need to fix anything when I see this green flashing light?
No repairs are needed. The 1 flash per second green indicator is a normal operating status, not a fault or warning. You only need to investigate further if the burner runs continuously for an unusually long time without shutting off, which could indicate a thermostat or control issue.
Is it safe to use my water heater when this light is flashing?
Yes, this indicator confirms the heater is functioning safely and normally. The control system has verified the burner is lit and operating within expected parameters. There is no safety concern associated with this specific green flash pattern.
Will resetting the water heater clear this flashing light?
Resetting is not necessary and will not change normal behavior. The green 1-flash pattern will return as soon as the heater calls for heat again after a reset. The indicator will only stop during a heating cycle if the setpoint temperature is reached and the burner shuts off on its own.
How much does it cost to address this flashing code on a Bradford White water heater?
Since this is a normal operating status and not a fault code, there is no repair cost associated with it. If a technician visit is desired to confirm system health, diagnostic service calls typically range from around $75 to $150 depending on your location and the service provider.

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