Bradford White Water Heater Error Code 6 flashes red (V2)

The 6 flashes red (V2) error code on a Bradford White water heater indicates a door temperature sensor failure. The door temperature sensor is a thermistor-based component mounted at or near the burner door assembly. Its primary function is to monitor temperatures at that location, providing the control board with data used to detect unsafe operating conditions such as overheating or combustion gas spillage near the door area. When the control board detects a signal from this sensor that falls outside the expected resistance or voltage range, it interprets the condition as either an open circuit or a short circuit and triggers this fault code.

An open circuit in the sensor circuit typically means the sensor itself has failed internally, or a wiring connection has broken or corroded, causing the signal to read as infinitely high resistance. A short circuit, on the other hand, drives the resistance to near zero, which the board also recognizes as an invalid reading. Both conditions prevent the control board from accurately monitoring door temperatures, so the unit locks out as a safety precaution. Service procedure ED-X covers the specific diagnostic steps for isolating whether the fault lies in the sensor itself or in the associated wiring harness and connector.

Proper diagnosis begins by inspecting the sensor connector at both the sensor end and the control board end for corrosion, pushed-back terminals, or physical damage. If the connections appear sound, the sensor's resistance should be measured and compared against the expected value for the ambient temperature at the time of testing. A sensor reading open or shorted when measured with a multimeter confirms replacement is necessary. If sensor resistance is within spec, the wiring harness between the sensor and control board should be traced for damage or continuity faults.