Bradford White Water Heater Error Code 3 flash

Three flashes on a Bradford White water heater indicate that the pressure switch or blower temperature switch did not close as expected during startup. These switches are part of the venting safety system and must confirm proper draft before the control board allows ignition. The heater will lock out and refuse to fire until the condition causing the switch to remain open is corrected.

The 3 flash code is a safety lockout, which means the heater has stopped operating to prevent a potentially unsafe condition. Because this fault relates to the venting system, it should be taken seriously. A compromised vent could allow combustion byproducts to accumulate if the unit were allowed to operate unchecked. Do not attempt to bypass the lockout, and address the underlying cause before returning the unit to service.

Repair costs depend on the specific cause. Clearing a vent blockage or reattaching pressure switch tubing may cost nothing beyond your time. Replacing a pressure switch typically runs between $20 and $80 for the part, while a blower motor replacement can range from $100 to $300 or more depending on the model. Adding labor for a service technician generally brings total repair costs to between $150 and $500 depending on the component involved and local labor rates.

Some causes of this error are DIY-accessible, such as clearing a blocked vent, reconnecting loose pressure switch tubing, or removing moisture from the sensing hose. Testing the pressure switch and blower motor for proper function requires a multimeter and some comfort with appliance diagnostics. Replacing components like the blower motor or pressure switch is within reach for experienced DIYers, but if you are unsure about working on gas appliances, a qualified technician should perform the repair.

Resetting the control board may temporarily clear the fault and allow a restart attempt, but the error will return if the underlying issue has not been resolved. The pressure switch or blower temperature switch must successfully close during the next startup sequence, or the lockout will reoccur. A reset is useful for confirming a repair was effective, but it is not a substitute for diagnosing and correcting the root cause.