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Error code reference

Bradford White Water Heater Error Code Short flash once per second

Gas Control V1

Bradford White codesBradford White water heater codes

Gas Control V1: Gas control is calling for heat (no fault); tank temperature is below setpoint of thermostat.

First step from the service manual

Normal operation.

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

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What Short flash once per second means on a Bradford White water heater

The short flash once per second on a Bradford White water heater is not a fault or error condition. It is a status indicator from the gas control valve (designated V1) communicating that the unit is actively calling for heat. This means the thermostat has sensed that the tank water temperature has dropped below the setpoint and has signaled the gas control to initiate a heating cycle. The burner should be firing or preparing to fire during this state.

The gas control valve on Bradford White water heaters integrates the thermostat, ignition logic, and flame sensing into a single assembly. When the water temperature falls below the dial setpoint, the internal thermostat closes the circuit and the gas control begins the heating sequence. The LED status light flashes at this once-per-second short pulse rate specifically to confirm normal, active heating operation to a technician or installer performing a visual check.

No corrective action is required when this flash pattern is observed. If you see this pattern, the unit is doing exactly what it is designed to do. The only reason to investigate further is if the burner does not appear to be running during this flash pattern, or if the tank never reaches setpoint temperature after an extended heating period. In those cases, separate diagnostics for gas supply, ignition components, or thermostat calibration would be appropriate.

Source: manufacturer service documentation.

Common causes of Short flash once per second

  1. 01

    Normal heating cycle after hot water use

    Wiring / connection

    The most frequent trigger for this status is everyday hot water consumption. When a shower, dishwasher, or other fixture draws hot water, cooler water enters the tank and the thermostat calls for heat to recover.

  2. 02

    Initial startup or cold water fill

    Wiring / connection

    When the water heater is first installed or refilled after a period of being drained, the tank water is at ambient temperature and well below setpoint, so the unit will display this pattern continuously until it reaches temperature.

  3. 03

    Thermostat setpoint recently increased

    Wiring / connection

    If the temperature dial on the gas control was recently turned up, the new setpoint will be higher than the current water temperature, triggering a call for heat until the tank catches up.

  4. 04

    High hot water demand or undersized unit

    Wiring / connection

    A household consistently drawing more hot water than the heater can recover may show this status frequently or almost continuously, indicating the unit is working at capacity but not necessarily malfunctioning.

  5. 05

    Heat loss from insulation or location

    Wiring / connection

    Units installed in unheated spaces such as garages or basements in cold climates may cycle more frequently due to standby heat loss through the tank walls, causing more frequent calls for heat.

See the test procedure for each cause

Frequently asked questions about Short flash once per second

What does Short flash once per second mean on a Bradford White water heater?
A short flash once per second from the status LED on a Bradford White water heater indicates that the gas control valve is calling for heat. The thermostat has detected that the tank water temperature is below the selected setpoint and the unit is actively in a heating cycle. This is a normal operating status, not a fault code.
Do I need to fix anything when I see this flash pattern?
No repair is needed when the once-per-second short flash is displayed. The unit is operating as designed. If the burner does not appear to be running while this pattern is active, or if the water never heats up after a prolonged period, then further diagnostics on the gas supply, ignition system, or gas control valve would be warranted.
Is it safe to use my water heater while this light is flashing?
Yes, this flash pattern confirms the heater is in a normal heating cycle and is completely safe to operate. There is no fault condition associated with this status. You can continue using hot water as normal.
Will resetting the water heater clear this flash pattern?
Resetting the unit is unnecessary and will not change the underlying condition. The flash pattern will only change once the water temperature reaches the thermostat setpoint and the call for heat ends. Resetting during an active heating cycle would simply restart the sequence.
How much does it cost to repair this issue on a Bradford White water heater?
No repair or parts are needed for this condition since it represents normal operation. If a technician visit is requested to confirm the unit is working correctly, expect a standard diagnostic service call fee, which typically ranges from $75 to $150 depending on your location and provider.

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