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Error code reference

Bradford White Water Heater Error Code 10

Air supply or exhaust blockage detected.

Bradford White codesBradford White water heater codes

Air supply or exhaust blockage detected.

First step from the service manual

Check intake and exhaust ports for obstructions. Check that nothing is blocking the flue inlet or exhaust. Verify proper clearance from combustibles around the unit.

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

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What 10 means on a Bradford White water heater

Error code 10 on a Bradford White water heater indicates that the control board has detected a restriction or blockage in the air supply or exhaust pathway. This is a safety shutdown triggered by the appliance's combustion system monitoring. Power-vent and direct-vent Bradford White models rely on a properly unobstructed intake and exhaust circuit to maintain safe combustion and remove flue gases from the living space. When airflow is compromised, the unit locks out to prevent incomplete combustion, backdrafting, or carbon monoxide accumulation.

The most frequent physical causes include debris such as bird nests, leaves, or ice blocking the exterior termination cap on either the intake or exhaust pipe. On direct-vent units, both pipes typically terminate close together on an exterior wall or roof, making them susceptible to seasonal blockages. Interior obstructions such as a disconnected or kinked vent pipe section can also restrict airflow enough to trigger the fault. The unit also requires adequate clearance from combustibles and sufficient makeup air in the installation space, so a recently tightened or sealed mechanical room can contribute to this fault.

After any physical obstruction is cleared, the control board may require a manual reset before the burner will re-ignite. If error code 10 returns shortly after reset with no visible blockage, the pressure switch or inducer motor assembly should be evaluated, as a failing inducer or a stuck pressure switch can mimic a true airflow restriction and generate the same fault code.

Source: manufacturer service documentation.

Common causes of 10

  1. 01

    Blocked exterior vent termination

    Wiring / connection

    Bird nests, leaves, ice dams, or other debris lodged in the exterior intake or exhaust cap are the most common triggers for this code. Visually inspect both termination points on the outside of the home for any obstruction.

  2. 02

    Ice or frost buildup on exhaust outlet

    Wiring / connection

    In cold climates, condensate from the exhaust can freeze at the termination cap and gradually seal off the outlet. This often occurs during extended cold snaps and may clear on its own when temperatures rise, but the cap should be inspected and cleared.

  3. 03

    Disconnected or damaged vent pipe section

    Part replacement

    A vent pipe joint that has separated, collapsed, or developed a significant kink inside the home will restrict airflow and trigger this fault. Trace the entire vent run from the unit to the exterior and check every joint and connection.

  4. 04

    Insufficient combustion air in the installation space

    Wiring / connection

    If the mechanical room or utility closet has been sealed more tightly since installation, the unit may not have adequate makeup air for combustion. Verify that air inlet vents or louvers for the space are open and unobstructed.

  5. 05

    Faulty inducer motor or pressure switch

    Part replacement

    A worn inducer blower motor that cannot develop adequate airflow, or a pressure switch stuck in the open position, can generate this code even when the vent path is physically clear. If the code returns immediately after clearing all obstructions, these components should be tested.

See the test procedure for each cause

Frequently asked questions about 10

What does 10 mean on a Bradford White water_heater?
Error code 10 on a Bradford White water heater signals that the unit has detected a blockage or restriction in the air supply or exhaust venting system. The heater shuts down as a safety precaution to prevent incomplete combustion and the potential buildup of carbon monoxide. You will need to locate and clear the obstruction before the heater will resume normal operation.
How do I fix error code 10 on my Bradford White water heater?
Start by inspecting the exterior intake and exhaust termination caps for visible blockages such as nests, ice, or debris and clear anything you find. Next, check that all vent pipe sections inside the home are properly connected and free of kinks or damage. Confirm the installation space has adequate airflow for combustion. Once the obstruction is resolved, reset the control board and monitor the unit to see if the code returns.
Is error code 10 on a Bradford White water heater dangerous?
The error code itself represents the heater working correctly as a safety system. The underlying cause, a blocked exhaust, is potentially serious because a restricted flue can allow carbon monoxide to enter the home if the unit were to operate. Do not attempt to bypass the lockout. Address the blockage before returning the unit to service, and consider testing your carbon monoxide detectors any time a venting fault occurs.
Will resetting the water heater clear error code 10?
A reset will clear the lockout and allow the burner to attempt ignition, but it will not resolve the underlying cause. If the vent obstruction is still present, the unit will detect the restricted airflow again and return to fault within a short time. Clear the blockage first, then perform the reset so the heater can resume normal operation without immediately faulting again.
How much does it cost to repair a Bradford White water heater showing error code 10?
If the cause is a simple external blockage you can clear yourself, there may be no parts cost at all. Replacing a damaged vent pipe section typically runs in the range of $20 to $100 in materials depending on pipe diameter and length. If the inducer motor or pressure switch has failed and needs replacement, labor and parts combined can range from $150 to $400 or more depending on your location and the specific components required.

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