Bradford White Water Heater Error Code 71

Error code 71 on a Bradford White water heater indicates a fault detected in the solenoid valve circuit, specifically affecting one or more of the four solenoid valves designated SV0, SV1, SV2, and SV3. These solenoid valves are electrically controlled components that regulate gas flow or water flow within the unit depending on the heater's configuration. The control board monitors the electrical circuit for each solenoid continuously, and when it detects an open circuit, short circuit, or out-of-range resistance reading, it triggers code 71 and shuts down operation to prevent unsafe conditions.

The most direct cause of this fault is a problem in the wiring harness connecting the control board to the solenoids. Damaged insulation, pinched wires, corroded terminals, or loose connector pins can all interrupt the circuit and cause the board to report a fault. Since the code covers all four solenoid channels simultaneously, a wiring harness fault near the common connector is often the root cause rather than individual solenoid failure.

If the wiring checks out, the solenoids themselves should be tested for resistance. Each solenoid coil has a rated resistance value, and a reading that is significantly higher, lower, or open indicates a failed coil. A shorted solenoid can also drag down the circuit and cause the control board to flag all channels. Diagnosis should include checking resistance at each solenoid individually and inspecting the harness for continuity and insulation integrity before replacing any components.