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Error code reference

Bradford White Water Heater Error Code 2 flashes (WR Electronic)

White Rodgers Electronic

Bradford White codesBradford White water heater codes

White Rodgers Electronic: Low thermopile voltage; main burner not lit. Probable causes: loose thermopile connections or weak pilot flame.

First step from the service manual

Check thermopile connections and pilot flame.

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

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

The 2-flash error code on a Bradford White water heater equipped with a White Rodgers electronic ignition system indicates that the thermopile is generating insufficient voltage to signal the gas valve that safe ignition conditions are met. The thermopile is a thermoelectric device located in the pilot assembly that converts heat from the pilot flame into a small DC voltage, typically in the range of 300 to 750 millivolts under normal operating conditions. When the control system detects that this voltage is too low, it interprets the condition as either no main burner ignition or an unsafe operating state, and the status LED responds with 2 flashes to communicate the fault.

The most common reasons for low thermopile voltage fall into two categories: poor electrical connections and an inadequate pilot flame. Loose or corroded connections at the thermopile lead wires can introduce resistance into the circuit, dropping the measured voltage below the threshold required to operate the gas valve. A weak pilot flame, caused by a partially clogged pilot orifice, low gas pressure, or improper air mixture, will not transfer enough heat to the thermopile tip to generate sufficient voltage. Both conditions can coexist, making it important to inspect the full circuit before replacing components.

Diagnosis should begin with a visual inspection of the pilot flame quality and a check of all thermopile wire connections at both the thermopile body and the gas valve terminals. A multimeter set to DC millivolts can measure thermopile output directly: readings below approximately 300 millivolts with the pilot lit typically confirm a failing thermopile or inadequate flame. Cleaning the pilot orifice, tightening connections, or replacing the thermopile assembly are the most common corrective actions.

Source: manufacturer service documentation.

Common causes of 2 flashes (WR Electronic)

  1. 01

    Loose or corroded thermopile connections

    Wiring / connection

    The wire leads connecting the thermopile to the gas valve can loosen over time or develop corrosion, increasing resistance and dropping the output voltage below the required threshold. Inspect both ends of the thermopile wiring for secure, clean connections.

  2. 02

    Weak or improperly sized pilot flame

    Wiring / connection

    A pilot flame that is too small will not heat the thermopile tip adequately, resulting in low millivolt output. Check that the flame is steady, blue, and engulfing the tip of the thermopile probe.

  3. 03

    Clogged pilot orifice

    Part replacement

    Debris or mineral deposits in the pilot orifice restrict gas flow, reducing flame size and thermopile heat input. The orifice can often be carefully cleaned, though replacement of the pilot assembly may be needed in severe cases.

  4. 04

    Failing or worn thermopile

    Part replacement

    Thermopiles degrade over years of use and eventually cannot produce adequate voltage even with a healthy pilot flame. A multimeter reading below roughly 300 millivolts DC with the pilot lit and connections secure points to a thermopile that needs replacement.

  5. 05

    Low gas supply pressure

    Wiring / connection

    Insufficient gas pressure at the unit can reduce pilot flame intensity enough to starve the thermopile of heat. This condition may be accompanied by weak flames at other gas appliances in the home and requires pressure testing by a qualified technician.

See the test procedure for each cause

Frequently asked questions about 2 flashes (WR Electronic)

What does 2 flashes (WR Electronic) mean on a Bradford White water_heater?
Two flashes on a Bradford White water heater with a White Rodgers electronic control indicates that the thermopile voltage is too low for the gas valve to allow the main burner to light. The thermopile is a sensor in the pilot assembly that generates a small DC voltage from the heat of the pilot flame. When that voltage falls below the required level, the control board logs the fault and prevents burner operation. Loose wiring connections and a weak pilot flame are the most common causes.
How do I fix a 2-flash error on my Bradford White water heater?
Start by inspecting the thermopile wire connections at both the thermopile body and the gas valve terminals, tightening any that are loose and cleaning any visible corrosion. Next, observe the pilot flame: it should be steady, blue, and surrounding the thermopile tip. If the flame appears weak or yellow, the pilot orifice may need cleaning or the gas pressure may need to be checked. If connections and flame quality are both acceptable, use a multimeter to measure thermopile output in DC millivolts; a reading below approximately 300 millivolts with the pilot burning typically means the thermopile itself needs to be replaced.
Is a 2-flash error on a Bradford White water heater a safety hazard?
The 2-flash fault is a protective shutdown, meaning the control system has detected an unsafe condition and is preventing the main burner from operating. The unit is behaving as designed by refusing to fire the burner without confirmed thermopile voltage. While the heater is not actively dangerous in this state, it should be diagnosed and repaired promptly to restore hot water and ensure all ignition safety systems are functioning correctly.
How much does it cost to repair a 2-flash thermopile fault on a Bradford White water heater?
If only loose connections are the cause, there may be no parts cost at all. Thermopile replacement parts typically range from $15 to $50 depending on the specific assembly required. If a service technician is needed for diagnosis or the repair, labor costs can bring the total to somewhere between $100 and $250. Gas pressure issues that require a professional pressure test and adjustment may add additional cost.
Will resetting my Bradford White water heater clear the 2-flash error code?
A manual reset may temporarily clear the fault indicator, but the error will return if the underlying cause has not been corrected. The 2-flash code reflects an actual measured condition: insufficient thermopile voltage. Until the pilot flame, wiring connections, or thermopile output are restored to acceptable levels, the control will continue to detect the fault and prevent main burner operation. Resetting without repairing is not a solution.

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