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Error code reference

Bradford White Water Heater Error Code 6-2 flash

Damper test circuit not working properly during burner operation; damper moved from full open position during…

Bradford White codesBradford White water heater codes

Damper test circuit not working properly during burner operation; damper moved from full open position during run cycle. System auto resets after 5 minutes.

First step from the service manual

See damper removal and installation on page 16.

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

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What 6-2 flash means on a Bradford White water heater

The 6-2 flash error on a Bradford White water heater indicates a fault in the damper test circuit during active burner operation. Specifically, the control system has detected that the flue damper moved away from the full open position during a run cycle, when it must remain fully open to allow proper exhaust gas evacuation. The damper test circuit continuously monitors damper position throughout burner operation, and any deviation from the full open state triggers this fault code. The system is designed to auto-reset after a 5-minute lockout period, allowing the control board to attempt normal operation again without manual intervention.

The flue damper is a motorized component that opens before burner ignition and must hold fully open throughout the heating cycle. If the damper partially closes, binds, or if the position feedback circuit loses continuity during burner operation, the control detects a mismatch between the expected and actual damper state. This can result from mechanical issues with the damper actuator, wiring faults between the damper assembly and the control board, or a faulty position switch inside the damper unit itself. Because exhaust gas venting is directly tied to damper position, the control correctly shuts down the burner when this condition is detected as a safety precaution.

Diagnosis should begin with damper removal and inspection as outlined on page 16 of the technical documentation. Technicians should check for physical obstructions preventing full travel, inspect the damper motor and linkage for wear or binding, verify continuity of the wiring harness connecting the damper to the control board, and test the position feedback switch for proper operation throughout the full range of damper travel.

Source: manufacturer service documentation.

Common causes of 6-2 flash

  1. 01

    Damper actuator or motor failure

    Part replacement

    The damper motor may be failing and unable to hold the damper in the full open position under load. This can often be identified by physically inspecting the damper during or immediately after a fault event to see if it has partially closed.

  2. 02

    Damper binding or mechanical obstruction

    Wiring / connection

    Debris, corrosion, or a warped damper blade can prevent the damper from staying fully open. Removing the damper assembly and manually cycling it through its full range of motion will reveal any binding or restriction.

  3. 03

    Faulty damper position switch

    Part replacement

    The position feedback switch inside the damper assembly confirms that the damper has reached and is holding the full open position. A worn or defective switch can send an incorrect signal to the control board even when the damper is physically open.

  4. 04

    Wiring harness fault between damper and control board

    Wiring / connection

    A loose connector, chafed wire, or broken lead in the wiring harness running from the damper assembly to the control board can cause intermittent or false position signals. Inspect all connectors and wire runs for damage or corrosion.

  5. 05

    Control board fault

    Part replacement

    If the damper assembly and wiring all test correctly, the control board itself may be misreading the damper circuit signal. This is a less common cause and should be considered only after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about 6-2 flash

What does 6-2 flash mean on a Bradford White water heater?
The 6-2 flash code means the damper test circuit detected that the flue damper moved out of the fully open position during burner operation. The control system requires the damper to stay fully open throughout the heating cycle to ensure safe exhaust venting. When this condition is detected, the burner shuts down as a safety measure. The unit is designed to auto-reset and attempt normal operation after a 5-minute waiting period.
Can I fix a 6-2 flash error myself on a Bradford White water heater?
Some causes of the 6-2 error, such as a mechanical obstruction or a loose wiring connector, can be addressed by a knowledgeable DIYer following the damper removal and installation procedure on page 16. However, replacing the damper actuator, position switch, or control board involves working near the gas train and electrical components, which is best handled by a licensed technician. If the error returns repeatedly after the auto-reset, professional diagnosis is strongly recommended.
Is a 6-2 flash error on a Bradford White water heater dangerous?
The control system triggers the 6-2 fault specifically as a safety response to a potential exhaust venting issue. If the damper is not fully open during burner operation, combustion gases could be restricted from exiting properly. The burner shuts down when this fault is detected, which limits immediate risk, but the underlying cause should be diagnosed and corrected before continuing normal operation to ensure safe venting.
Will the Bradford White water heater reset itself after a 6-2 flash error?
Yes, the 6-2 flash error includes an automatic reset after a 5-minute lockout period. The control board will attempt to resume normal operation without requiring manual intervention. However, if the root cause of the damper fault has not been resolved, the error will likely return after the next burner cycle, and repeated faults should be investigated rather than relying solely on the auto-reset function.
How much does it cost to repair a Bradford White water heater showing a 6-2 flash code?
Repair costs depend on the root cause identified during diagnosis. A service call alone typically runs in the range of $75 to $150. If only wiring or a connector needs attention, total costs may stay relatively low. Replacing a damper actuator assembly or damper unit can add $100 to $300 or more in parts, while a control board replacement can range from $150 to $400 or higher depending on the model. Getting a diagnosis before committing to parts is the best approach.

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