Bradford White Water Heater Error Code 1 flash per second

The 1 flash per second error code on a Bradford White water heater indicates that a weak pilot signal was detected during the last call for heat. This fault is generated by the gas valve control module, which continuously monitors the millivolt output from the thermocouple or thermopile assembly. When the signal falls below the minimum threshold required to confirm a stable pilot flame, the control locks out and begins flashing this diagnostic code. The condition is logged based on the previous heating cycle, meaning the pilot may have since extinguished or may still be present but burning weakly.

The most common root causes involve the pilot assembly itself or the gas supply feeding it. A blocked or restricted pilot tube will reduce gas flow to the pilot burner, producing a small, unstable flame that cannot heat the thermocouple adequately. Oxidation or carbon buildup on the pilot electrode degrades electrical conductivity and weakens the sensed signal even when the flame appears visually acceptable. Damaged or corroded wiring between the thermocouple and the gas valve can introduce resistance into the circuit, dropping the millivolt reading below the control's acceptable range.

Low gas supply pressure is another contributing factor, particularly if other gas appliances in the home are running simultaneously or if there is a supply issue at the meter or regulator. Diagnosis should follow Service Procedure II, which involves a systematic inspection of pilot flame stability, tube condition, electrode surface condition, wiring integrity, and incoming gas pressure. Addressing each of these in sequence will identify whether the fault is mechanical, chemical, or supply-related.