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

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.

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.

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.

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.

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.