Bradford White Water Heater Error Code 6-3 flash

The 6-3 flash code means the pilot flame went out while the water heater was in the middle of a run cycle. The unit detected the loss of flame signal and shut down as a safety measure. The system is programmed to automatically reset and retry after a 5-minute delay. If the fault repeats, a physical cause such as a blocked pilot tube, electrode issue, or gas pressure problem needs to be identified and corrected.

The 6-3 code represents a safety shutdown triggered by flame loss, which is the control system working as intended. The heater stops operation rather than allowing unburned gas to accumulate. However, if the pilot fails repeatedly or you smell gas near the unit, do not attempt to restart the heater and contact a qualified technician or your gas utility immediately.

The unit resets itself automatically after 5 minutes, so no manual reset action is required for the initial recovery attempt. If you want to inspect the pilot yourself, check for visible debris around the pilot tube, ensure the area around the water heater has adequate ventilation, and look for any obviously damaged wiring. Gas pressure testing and electrode replacement are best performed by a qualified technician with the proper tools and training.

The water heater is designed to auto-reset after 5 minutes and attempt to relight the pilot. If the underlying cause is a one-time event such as a brief gas supply interruption, the unit may recover on its own. However, if the 6-3 fault repeats across multiple cycles, a physical problem with the pilot assembly, gas pressure, combustion air supply, or wiring is likely present and requires hands-on inspection.

Repair costs vary depending on the root cause. Cleaning a blocked pilot tube or improving combustion air access may cost little to nothing beyond a service call fee, which typically ranges from $75 to $150. Replacing a faulty pilot electrode or damaged wiring harness will add parts costs, generally in the $20 to $80 range for components, with total repair costs typically falling between $100 and $300 depending on labor rates in your area.