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Error code reference

Bradford White Water Heater Error Code 4 flashes

Gas Control V1

Bradford White codesBradford White water heater codes

Gas Control V1: Excessive tank temperature; system must be reset. Probable causes: temperature sensor out of calibration or faulty gas control.

First step from the service manual

Replace gas control.

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

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What 4 flashes means on a Bradford White water heater

The 4-flash error code on a Bradford White water heater indicates that the Gas Control valve (V1) has detected an excessive tank temperature condition. This is a safety-triggered shutdown, meaning the control has sensed temperatures beyond the acceptable operating threshold and has locked out the system to prevent overheating damage or a dangerous pressure event. The unit will not resume normal operation until the root cause is addressed and the gas control is manually reset.

The two primary causes identified for this fault are a temperature sensor that has drifted out of calibration and a faulty gas control valve assembly. The temperature sensor is integrated into the gas control unit on most Bradford White designs, meaning the sensor and control are not separate serviceable components. If the sensor is reading temperatures inaccurately, it may trigger an excessive temperature fault even when the actual water temperature is within safe limits. Conversely, a legitimate overheating event could also set this code if the control allowed the burner to run unchecked.

Because the temperature sensor is typically housed within the gas control assembly itself, the recommended first diagnostic step is direct replacement of the gas control. Attempting to reset the unit without addressing the underlying fault will likely result in the error returning. Technicians should also verify that no external factors, such as a stuck open gas valve or blocked flue, contributed to an actual overtemperature condition before condemning the control outright.

Source: manufacturer service documentation.

Common causes of 4 flashes

  1. 01

    Faulty gas control valve

    Part replacement

    The gas control valve may be malfunctioning internally, either failing to shut off the burner at the correct temperature or generating a false fault reading. Replacement of the gas control is the primary recommended repair step.

  2. 02

    Temperature sensor out of calibration

    Part replacement

    The temperature sensor embedded in the gas control assembly may have drifted out of calibration, causing it to report excessive temperatures even when actual tank temps are normal. Because the sensor is integrated into the gas control on most Bradford White units, replacing the control addresses this cause as well.

  3. 03

    Actual overheating event

    Wiring / connection

    If the thermostat or gas control previously allowed the burner to run longer than intended, the tank may have genuinely reached excessive temperatures. Check the temperature and pressure relief valve for signs of activation, such as discharge or weeping, as evidence of a real overtemperature event.

  4. 04

    Blocked or restricted flue

    Wiring / connection

    A partially blocked flue can cause heat to back up around the tank, contributing to elevated temperatures that trigger this code. Inspect the flue and venting path for obstructions, debris, or improper installation before completing the repair.

See the test procedure for each cause

Frequently asked questions about 4 flashes

What does 4 flashes mean on a Bradford White water_heater?
Four flashes on a Bradford White water heater indicates that the Gas Control valve (V1) has detected an excessive tank temperature and has shut the unit down as a safety measure. The system will not restart on its own and must be reset after the cause is resolved. The most likely causes are a faulty gas control valve or a temperature sensor that is out of calibration. Because the sensor is part of the gas control assembly, replacing the gas control is the standard repair.
Can I reset the 4-flash error myself on a Bradford White water heater?
You can attempt a manual reset by following the reset procedure on the gas control, but the error will likely return if the underlying cause is not corrected first. If the gas control or its integrated temperature sensor is faulty, resetting alone will not resolve the problem. It is recommended to have a qualified technician inspect and replace the gas control before relying on a reset to restore normal operation.
Is a 4-flash error on a Bradford White water heater dangerous?
The 4-flash code is a safety lockout designed to protect against overheating, so the heater shutting down is actually the system working as intended. However, the underlying cause of the excessive temperature detection should be taken seriously and diagnosed promptly. If the temperature and pressure relief valve has discharged or the tank has been genuinely overheated, do not restart the unit until a technician has inspected it.
How much does it cost to fix a 4-flash error on a Bradford White water heater?
The primary repair for this error code is replacement of the gas control valve. Parts and labor combined typically range from $200 to $600 depending on the specific model, your location, and the service provider. If the unit is still under warranty, the gas control may be covered, so check your warranty status before purchasing parts independently.
Will resetting the water heater clear the 4-flash error code permanently?
A reset will clear the lockout and allow the unit to attempt normal operation, but it will not fix the root cause. If the gas control valve is faulty or the temperature sensor is out of calibration, the 4-flash error will return, sometimes quickly. A permanent fix requires replacing the gas control assembly rather than relying on repeated resets.

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