Bradford White Water Heater Error Code 72

Code 72 indicates the flame sensing device is faulty and the flame rod is not detecting flame properly. The control board monitors a small microamp signal from the flame rod to confirm the burner is lit. When that signal is absent or too weak, the unit shuts down and logs code 72 to prevent unsafe operation.

A reset may temporarily clear the code and allow the unit to attempt another ignition cycle, but if the underlying problem is not fixed, the fault will return promptly. Code 72 is a component fault, not a nuisance trip, so the flame rod issue must be diagnosed and corrected for the unit to operate reliably.

If the fix is simply cleaning the flame rod, costs are minimal and limited to your time. If the flame rod needs to be replaced, parts typically range from around $15 to $50 depending on the model, with professional labor adding $75 to $200 or more depending on your location and the service provider.

In many cases, yes. The most common fix is removing the flame rod and cleaning carbon deposits off the tip with fine sandpaper, then reinstalling it and confirming it is properly positioned within the flame. Also check the wiring and inspect inside the burner chamber for debris blocking the flame. If these steps do not resolve the code, the rod will need to be replaced.

The unit shuts down the burner when it logs code 72, so the heater will not produce hot water while the fault is active. The shutdown itself is a safety function. Do not attempt to bypass the flame sensing circuit, as it exists to confirm combustion is occurring before allowing gas to continue flowing.