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Error code reference

Bradford White Water Heater Error Code 2 flashes (yellow)

Gas Control V2

Bradford White codesBradford White water heater codes

Gas Control V2: Low thermopile voltage; main valve not turned on.

First step from the service manual

Check thermopile and its connections; check pilot flame. See Service Procedure II and VI.

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

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What 2 flashes (yellow) means on a Bradford White water heater

The 2 flashes (yellow) error code on a Bradford White water heater indicates that the Gas Control V2 has detected low thermopile voltage while the main gas valve has not been activated. The thermopile is a thermoelectric device positioned in the pilot flame that generates the DC millivolt output required to power the gas control valve and allow the main burner to operate. When the thermopile output falls below the minimum threshold required by the gas control, the valve logic circuit withholds the signal to open the main gas valve, resulting in this fault condition.

The thermopile generates voltage proportional to the heat it absorbs from the pilot flame. A healthy thermopile in a strong pilot flame typically produces sufficient millivoltage to satisfy the gas control's requirements. Low voltage output can result from a weak or improperly positioned pilot flame, a thermopile element that has degraded over time, loose or corroded connections at the thermopile lead terminals, or contamination on the thermopile tip. The gas control module itself evaluates the incoming voltage continuously, so any intermittent drop will trigger this fault.

Diagnosis should begin with a visual inspection of the pilot flame and a check of all thermopile wiring connections at the gas control valve. A multimeter can be used to measure thermopile output voltage directly. If flame and connections are confirmed good but voltage remains low, thermopile replacement is the next step. Bradford White Service Procedures II and VI provide specific guidance for thermopile testing and pilot system inspection on these units.

Source: manufacturer service documentation.

Common causes of 2 flashes (yellow)

  1. 01

    Weak or improperly positioned pilot flame

    Wiring / connection

    A pilot flame that is too small, lifting off the thermopile tip, or partially blocked by debris will not heat the thermopile adequately, reducing its millivolt output. Inspect the pilot flame visually for a strong, steady blue flame that fully engulfs the thermopile tip.

  2. 02

    Degraded or failed thermopile

    Part replacement

    Thermopiles lose efficiency over time due to thermal cycling and oxidation at the tip. A multimeter reading of millivolt output below the gas control's minimum threshold while the pilot is burning confirms a worn thermopile that needs replacement.

  3. 03

    Loose or corroded thermopile connections

    Wiring / connection

    The lead wire connections at the gas control valve terminals can loosen or corrode, increasing resistance and reducing the effective voltage reaching the control. Inspect both terminals for tight fit and clean contact surfaces.

  4. 04

    Blocked or dirty pilot orifice

    Wiring / connection

    Sediment or debris in the pilot orifice restricts gas flow to the pilot burner, resulting in a reduced flame that cannot heat the thermopile sufficiently. Cleaning the pilot orifice can restore proper flame size.

  5. 05

    Faulty gas control valve (V2)

    Part replacement

    If the thermopile output tests within normal range and all connections are secure, the gas control valve's internal voltage-sensing circuit may have failed. Replacement of the gas control assembly would be required in this case.

See the test procedure for each cause

Frequently asked questions about 2 flashes (yellow)

What does 2 flashes (yellow) mean on a Bradford White water heater?
Two yellow flashes on a Bradford White water heater indicate that the gas control valve has detected low thermopile voltage and has prevented the main gas valve from opening. The thermopile is a small sensor in the pilot flame that generates the millivoltage needed to power the gas control. When this voltage is too low, the heater cannot start the main burner and will not produce hot water.
How do I fix the 2 yellow flashes error on my Bradford White water heater?
Start by checking the pilot flame to confirm it is burning steadily and fully contacting the thermopile tip. Inspect the thermopile wire connections at the gas control valve for looseness or corrosion and reseat them if needed. If the pilot and connections look good, use a multimeter to test thermopile millivolt output. A thermopile producing insufficient voltage with a strong pilot flame should be replaced. Bradford White Service Procedures II and VI cover these steps in detail.
Is it safe to continue using my water heater when it shows 2 yellow flashes?
When this fault is active, the gas control has intentionally blocked the main burner from firing, so gas is not flowing to the main burner. The unit is in a controlled lockout state rather than an unsafe operating condition. However, the heater will not heat water until the fault is resolved, and any gas appliance issue should be diagnosed and corrected promptly by a qualified technician.
Will resetting the water heater clear the 2 yellow flashes error?
A reset may temporarily clear the fault display, but if the underlying cause such as a weak pilot flame, faulty thermopile, or poor connections has not been corrected, the error will return once the gas control evaluates thermopile voltage again. Resetting without repairing the root cause will not restore normal water heater operation long term.
How much does it cost to repair the 2 yellow flashes error on a Bradford White water heater?
Repair costs vary depending on the cause. Cleaning the pilot orifice or tightening connections may cost nothing beyond a service call fee, which typically ranges from $75 to $150. Thermopile replacement parts generally range from $20 to $60, with total repair costs including labor falling between $100 and $250. If the gas control valve itself needs replacement, costs can range from $200 to $400 or more depending on the model and local labor rates.

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