Bradford White Water Heater Error Code 1 flash/sec

The 1 flash per second error code on a Bradford White water heater indicates that the control module detected a weak pilot signal during the most recent call for heat. This signal originates from the pilot electrode, which generates a small microamp current through a process called flame rectification. The thermocouple or flame sensor sends this current back to the gas valve's control circuit. When that signal falls below the minimum threshold required for the control to confirm a stable flame, it logs this fault code rather than allowing the gas valve to remain open unsafely.

The most common root causes involve conditions that degrade the quality or consistency of the pilot flame itself. A partially blocked or restricted pilot tube limits gas flow, producing a smaller, weaker flame that cannot generate sufficient ionization current. Oxidation or carbon buildup on the pilot electrode insulates the metal tip and reduces its ability to conduct the rectified current signal back to the control. Physical damage to the wiring between the pilot assembly and the gas valve control can also introduce resistance or intermittent breaks in the signal path.

Because this fault is recorded on the "last call for heat," it may not present as an active outage every time. In some cases, the pilot may still appear lit but is producing an unstable or flickering flame that occasionally drops below the detection threshold. Technicians should inspect the pilot assembly closely for any signs of oxidation, debris obstruction, or wire insulation damage before condemning the gas valve or control module.