Bradford White Water Heater Error Code 6

Error code 6 means the control board detected a flame signal outside of the normal ignition sequence, either before the gas valve opened or after it closed. This is a safety fault that causes the heater to lock out and stop operating. It points to a problem with the flame sensor, gas valve, associated wiring, or the control board itself. The heater will not attempt to restart until the fault is investigated and cleared.

Yes, this code should be treated as a serious condition. Flame detected outside of the normal sequence can indicate a gas valve that is not shutting off properly or a combustion event occurring without the control board initiating it. The heater locks out as a protective measure. Do not bypass the lockout or attempt to force the heater to operate until the cause has been identified and corrected by a qualified technician.

Repair costs depend on the failed component. Cleaning or replacing a flame sensor is typically a lower-cost repair, often in the range of $75 to $200 including labor. Replacing a gas valve or combination gas control can run significantly higher, typically between $200 and $500 or more with labor. Control board replacement falls in a similar range. A diagnostic service call is usually needed first to pinpoint which component is at fault.

A manual reset may temporarily clear the lockout and allow the heater to attempt another ignition cycle, but if the underlying problem is not corrected, the fault will return. Because code 6 is a safety-related condition involving out-of-sequence flame detection, simply resetting the unit without diagnosing the root cause is not recommended. Persistent or recurring code 6 faults require hands-on inspection of the flame sensor, gas valve, and wiring.

Start by inspecting the flame sensor rod for carbon buildup or physical contact with grounded metal, and clean it if necessary. Check all wiring between the sensor and the control board for damage or shorts. If the sensor and wiring are in good condition, the gas valve should be evaluated for proper shutoff, and the control board should be tested. Replacement of the gas valve or control board may be required depending on what the inspection reveals.