Bradford White Water Heater Error Code Heartbeat (alternates bright/dim)

The Heartbeat pattern, where the status light alternates between bright and dim, means the thermostat is calling for heat because the tank water temperature has fallen below the selected set point. This is a normal operational indicator, not a fault or error. The burner is running or preparing to run to heat the water back up to the desired temperature. No service action is needed.

Yes, it is completely safe to use hot water while the Heartbeat indicator is active. The signal just means the heater is in a heating cycle. Drawing water during this time is normal and the unit will continue heating until it reaches the set temperature.

There is no cost associated with the Heartbeat indicator because it is not a fault condition. The only adjustment that may be appropriate is turning the thermostat dial to your preferred temperature setting, which requires no parts or service. If you are concerned about high energy usage from frequent heating cycles, a technician inspection typically costs between 75 and 150 dollars depending on your area.

No repair is needed when the Heartbeat pattern is the only indicator showing. It simply means your water heater is actively heating water, which is normal operation. If the pattern continues for an unusually long time, more than an hour or two without any hot water draw, it may be worth investigating whether the burner is completing its cycle properly.

Resetting the unit is not necessary and will not change anything, because the Heartbeat pattern is not a fault code. The pattern will clear on its own once the water temperature reaches the thermostat set point and the call for heat ends. If you want the unit to reach temperature faster, avoid drawing hot water until the heating cycle completes.