Bradford White Water Heater Error Code 1 flash per second

One flash per second on a Bradford White water heater indicates that a weak pilot signal was detected during the last call for heat. The gas valve control module monitors the millivolt output from the thermocouple or thermopile and triggered this fault when the signal fell below an acceptable level. The heater stopped operating as a safety measure. Common causes include a blocked pilot tube, a fouled thermocouple, damaged wiring, or low gas pressure.

When this error is active, the water heater has already shut down as a safety precaution and will not produce hot water. The unit should not be forced back into operation until the underlying cause is identified and corrected. A weak or unstable pilot can lead to unburned gas accumulation, so addressing the fault before resuming normal use is important.

Repair costs depend on what component is at fault. Thermocouple or thermopile replacement is typically the most common fix and parts generally range from $15 to $60 depending on the assembly. If a technician is needed for diagnosis and repair, total service costs can range from $100 to $300 or more. Issues related to gas supply pressure may require a gas company visit, which could involve separate fees.

Start by inspecting the pilot assembly following Service Procedure II. Check the pilot tube for blockage or restriction, examine the electrode for oxidation or carbon deposits, and inspect all wiring between the pilot and gas valve for damage or corrosion. Also verify that gas supply pressure is adequate. Cleaning or replacing the thermocouple and clearing any tube obstruction resolves the fault in most cases.

Resetting the control may allow the unit to attempt ignition again, but if the underlying problem such as a blocked pilot tube, weak thermocouple, or low gas pressure is not corrected, the fault will return. The error code reflects a condition that was present during the last heating cycle, so a reset alone is not a repair. Diagnose and resolve the root cause first.