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Error code reference

Bradford White Water Heater Error Code 5 flashes red (V2)

Water temperature sensor failure.

Bradford White codesBradford White water heater codes

Water temperature sensor failure.

First step from the service manual

Check water temperature sensor and its connection for open circuits, shorts, or differences in resistance between the two sensor elements. Replace gas control.

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

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What 5 flashes red (V2) means on a Bradford White water heater

The 5 flashes red (V2) error code on a Bradford White water heater indicates a water temperature sensor failure. This sensor is a dual-element thermistor assembly integrated into the gas control valve unit. The control board monitors both sensor elements continuously and compares their resistance readings against expected values. When the control detects an open circuit, a short circuit, or a significant resistance discrepancy between the two sensor elements, it triggers this fault code and shuts down the burner to prevent unsafe water temperatures.

The water temperature sensor plays a critical role in regulating burner operation. It feeds real-time temperature data to the gas control, which uses that information to cycle the burner on and off to maintain the setpoint. If either sensor element reads outside the expected resistance range, or if the two elements differ substantially from each other, the control interprets this as a failed or unreliable sensor and will not allow normal operation to continue.

Diagnosis begins with a physical inspection of the sensor wiring harness and connector for corrosion, loose pins, or damaged insulation. Both sensor elements should then be tested with a multimeter for resistance continuity and compared against each other. If wiring checks out and the resistance values are incorrect or mismatched, the gas control valve assembly, which houses the sensor, must be replaced. The sensor is not typically serviceable as a standalone component and is replaced as part of the gas control unit.

Source: manufacturer service documentation.

Common causes of 5 flashes red (V2)

  1. 01

    Failed water temperature sensor element

    Part replacement

    One or both thermistor elements inside the gas control have failed, producing an out-of-range or open resistance reading. This is the most common root cause of this fault code.

  2. 02

    Resistance mismatch between the two sensor elements

    Part replacement

    The two sensor elements within the assembly are reading significantly different resistance values from each other. This discrepancy signals an internal sensor fault even if neither element reads as completely open or shorted.

  3. 03

    Loose or corroded sensor connector

    Wiring / connection

    A poor connection at the sensor wiring harness plug can cause intermittent or false open-circuit readings. Inspect the connector pins for corrosion, looseness, or bent terminals and reseat the connection firmly.

  4. 04

    Damaged sensor wiring harness

    Part replacement

    Physical damage to the wires running between the sensor and the gas control circuit board, such as chafing, heat damage, or rodent damage, can create shorts or open circuits that trigger this fault.

  5. 05

    Internal gas control valve failure

    Part replacement

    If the wiring and connector check out correctly and sensor resistance readings are within spec, the fault may lie within the gas control unit itself. Replacing the gas control valve assembly resolves this condition.

See the test procedure for each cause

Frequently asked questions about 5 flashes red (V2)

What does 5 flashes red (V2) mean on a Bradford White water heater?
Five red flashes on a Bradford White water heater indicate a water temperature sensor failure. The gas control is detecting an open circuit, a short circuit, or a resistance mismatch between the two internal sensor elements. The heater shuts down the burner when this fault is active to prevent unsafe operation. Diagnosis involves checking the sensor wiring and resistance values, with the gas control valve typically requiring replacement.
Can I fix the 5 flashes red error myself?
A knowledgeable DIYer can start by inspecting the sensor wiring harness and connector for visible damage, corrosion, or loose pins and reseating the connection. Testing the two sensor elements with a multimeter for resistance and continuity requires basic electrical skills. However, if the sensor or gas control valve needs replacement, that work involves the gas supply system and is best handled by a licensed technician in most jurisdictions.
Is it safe to use my water heater when it shows 5 red flashes?
The water heater will not operate the burner while this fault code is active, so there is no immediate danger of overheating. However, you will not have hot water until the fault is resolved. Do not attempt to bypass the fault or force the heater to run, as the sensor failure means the control cannot reliably monitor water temperature.
Will resetting the water heater clear the 5 red flashes error?
A simple reset will not permanently clear this fault if the underlying sensor failure is still present. The control will recheck the sensor on startup and re-trigger the fault code if it detects the same open circuit, short, or resistance mismatch. The error will only clear once the sensor wiring issue is corrected or the gas control valve is replaced.
How much does it cost to repair the 5 red flashes error on a Bradford White water heater?
Repair costs depend on what component is at fault. If the fix is a corroded connector or damaged wire, labor costs may be modest, typically in the range of $75 to $200 depending on your area. If the gas control valve assembly requires replacement, parts and labor combined can range from $300 to $600 or more. Getting a diagnostic quote from a licensed plumber or HVAC technician before authorizing repairs is recommended.

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