Bradford White Water Heater Error Code 2 flashes (yellow)

Two yellow flashes on a Bradford White water heater indicate that the gas control valve has detected low thermopile voltage and has prevented the main gas valve from opening. The thermopile is a small sensor in the pilot flame that generates the millivoltage needed to power the gas control. When this voltage is too low, the heater cannot start the main burner and will not produce hot water.

When this fault is active, the gas control has intentionally blocked the main burner from firing, so gas is not flowing to the main burner. The unit is in a controlled lockout state rather than an unsafe operating condition. However, the heater will not heat water until the fault is resolved, and any gas appliance issue should be diagnosed and corrected promptly by a qualified technician.

Repair costs vary depending on the cause. Cleaning the pilot orifice or tightening connections may cost nothing beyond a service call fee, which typically ranges from $75 to $150. Thermopile replacement parts generally range from $20 to $60, with total repair costs including labor falling between $100 and $250. If the gas control valve itself needs replacement, costs can range from $200 to $400 or more depending on the model and local labor rates.

Start by checking the pilot flame to confirm it is burning steadily and fully contacting the thermopile tip. Inspect the thermopile wire connections at the gas control valve for looseness or corrosion and reseat them if needed. If the pilot and connections look good, use a multimeter to test thermopile millivolt output. A thermopile producing insufficient voltage with a strong pilot flame should be replaced. Bradford White Service Procedures II and VI cover these steps in detail.

A reset may temporarily clear the fault display, but if the underlying cause such as a weak pilot flame, faulty thermopile, or poor connections has not been corrected, the error will return once the gas control evaluates thermopile voltage again. Resetting without repairing the root cause will not restore normal water heater operation long term.