mypros+
Error code reference

Bradford White Water Heater Error Code 2 flashes

Gas Control V1

Bradford White codesBradford White water heater codes

Gas Control V1: Weak pilot signal detected; system will reset when pilot flame is sufficient. Probable causes: thermopile failure, unstable pilot, pilot tube blocked or restricted.

First step from the service manual

See Service Procedure II (Thermocouple/Thermopile Testing) and Service Procedure VI (Pilot Testing/Cleaning).

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

MyPros+ Max

Get the full diagnostic procedure for 2 flashes.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What 2 flashes means on a Bradford White water heater

The 2-flash error code on a Bradford White water heater indicates that the Gas Control Valve (V1) has detected a weak or insufficient pilot signal from the thermopile. The thermopile is a thermoelectric device that generates a small DC voltage when heated by the pilot flame. This voltage is what the gas control valve uses to confirm pilot presence and allow the main gas valve to open. When the thermopile output falls below the minimum threshold required by the control valve, the unit triggers the 2-flash fault and enters a reset cycle, waiting until pilot flame strength is sufficient to generate an acceptable signal.

The three primary causes identified for this fault are thermopile failure, an unstable pilot flame, and a blocked or restricted pilot tube. A failing thermopile may produce low millivolt output even when the pilot appears to be burning normally, making it a common culprit that can be confirmed through voltage testing. An unstable pilot can result from drafts, low gas pressure, or contamination in the pilot assembly. A blocked pilot orifice or tube restricts gas flow to the pilot burner, reducing flame size and heat output, which directly reduces thermopile output.

Diagnosis should follow Service Procedure II for thermopile testing and Service Procedure VI for pilot inspection and cleaning. These procedures cover measuring thermopile millivolt output under load and no-load conditions, visually inspecting the pilot flame characteristics, and cleaning or clearing any restriction in the pilot tube or orifice. The system will automatically reset once the pilot flame is strong enough to generate a sufficient thermopile signal, so the root cause must be corrected before reliable operation will resume.

Source: manufacturer service documentation.

Common causes of 2 flashes

  1. 01

    Thermopile failure

    Part replacement

    The thermopile generates the millivolt signal that the gas control valve relies on to confirm pilot presence. A worn or failed thermopile produces insufficient voltage even with a visually normal pilot flame, and this can be confirmed by measuring its output with a millivolt meter.

  2. 02

    Blocked or restricted pilot tube

    Wiring / connection

    Debris, sediment, or corrosion inside the pilot tube or orifice restricts gas flow, resulting in a small, weak pilot flame that cannot adequately heat the thermopile. Inspecting and cleaning the pilot assembly per Service Procedure VI will identify this condition.

  3. 03

    Unstable pilot flame

    Wiring / connection

    Drafts in the installation area, fluctuating gas supply pressure, or contamination in the pilot burner can cause the flame to flicker or lift off the thermopile tip intermittently. This produces an inconsistent millivolt signal that falls in and out of the acceptable range.

  4. 04

    Thermopile connection or wiring issue

    Wiring / connection

    Loose, corroded, or damaged connections between the thermopile and the gas control valve can introduce resistance into the circuit and reduce the effective signal reaching the valve. Inspecting and securing all electrical connections at the gas control is part of the diagnostic process.

  5. 05

    Gas control valve (V1) internal fault

    Part replacement

    If thermopile output tests within specification and the pilot flame is confirmed strong and stable, the gas control valve itself may have an internal fault causing it to misread or reject an otherwise acceptable thermopile signal. This is the least common cause and requires valve replacement.

See the test procedure for each cause

Frequently asked questions about 2 flashes

What does 2 flashes mean on a Bradford White water heater?
Two flashes on a Bradford White water heater indicates the Gas Control Valve (V1) has detected a weak pilot signal from the thermopile. The thermopile must generate enough millivolt output for the control valve to confirm the pilot flame is present and stable. Until that threshold is met, the unit will not allow the main burner to operate. The heater will attempt to reset automatically once a sufficient signal is detected.
Can I fix the 2-flash error on my Bradford White water heater myself?
Some causes of the 2-flash code, such as a dirty or blocked pilot orifice, can be addressed by a knowledgeable DIYer following Service Procedure VI for pilot inspection and cleaning. However, testing the thermopile with a millivolt meter and replacing components requires familiarity with gas appliance repair. If you are not comfortable working on gas systems, a licensed technician should perform the diagnosis and any required repairs.
Is a 2-flash error on a Bradford White water heater dangerous?
The 2-flash fault is a safety response, not a hazard indicator. The control valve is withholding main burner operation because it cannot confirm adequate pilot flame presence, which is the intended safe behavior. While the condition itself is not immediately dangerous, you should not attempt to bypass the control or force the unit to operate. Have the underlying cause corrected before returning the unit to service.
Will resetting the water heater clear the 2-flash error code?
The Bradford White gas control is designed to reset automatically once the thermopile signal returns to an acceptable level. However, if the root cause is a failed thermopile, a clogged pilot tube, or another unresolved issue, the fault will return. A reset without correcting the underlying problem provides only temporary relief if any relief at all.
How much does it cost to repair a Bradford White water heater showing 2 flashes?
Repair costs depend on the root cause. Pilot cleaning is generally a low-cost service call, typically in the range of $75 to $150 for labor. Thermopile replacement parts are relatively inexpensive, often $15 to $50 for the component, with total repair costs including labor ranging from $100 to $250. If the gas control valve itself requires replacement, costs can range from $200 to $450 or more depending on the model and labor rates in your area.

Related Bradford White water heater codes

All Bradford White water heater codes
View all 98 Bradford White water heater codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass