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Error code reference

Bradford White Water Heater Error Code Heartbeat

Thermostat calling for heat (no fault)

Bradford White codesBradford White water heater codes

Thermostat calling for heat (no fault). Tank temperature is below set point of thermostat.

First step from the service manual

Normal operation. Adjust thermostat to desired temperature level.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What Heartbeat means on a Bradford White water heater

The Heartbeat status indicator on a Bradford White water heater is not a fault code at all. It is a normal operational signal indicating that the thermostat is actively calling for heat because the water temperature inside the tank has dropped below the thermostat's set point. The control board uses this blinking or pulsing pattern to communicate that the burner or heating element is engaged in a heating cycle, working to bring the stored water back up to the target temperature.

This condition occurs during everyday use. Any time hot water is drawn from the tank, cold water enters from the supply line and lowers the overall tank temperature. The thermostat detects this drop and signals the burner or element to fire. The Heartbeat indicator simply confirms this sequence is happening as designed. No intervention is required when this indicator is active during or shortly after periods of hot water usage.

If the Heartbeat indicator appears to run continuously for extended periods without the tank reaching the set point temperature, that would be worth investigating further. Possible reasons for a prolonged heating cycle include a very high demand for hot water, a thermostat set too high for current conditions, sediment buildup reducing heat transfer efficiency, or an undersized unit for the household load. In these situations, checking the thermostat setting and flushing sediment from the tank are the appropriate first steps.

Source: manufacturer service documentation.

Common causes of Heartbeat

  1. 01

    Normal hot water demand

    Wiring / connection

    After hot water is used, cold water enters the tank and lowers its temperature. The thermostat detects this drop and initiates a heating cycle, which is the expected and intended operation.

  2. 02

    Thermostat set point too high

    Wiring / connection

    If the thermostat is set to a very high temperature, the unit will need to run longer and more frequently to reach and maintain that set point. Adjusting the thermostat to a moderate level such as 120 degrees Fahrenheit can reduce run time.

  3. 03

    High household hot water demand

    Wiring / connection

    Multiple simultaneous uses or back-to-back showers can deplete the tank faster than it recovers, causing the thermostat to call for heat for an extended period. This is a usage pattern issue rather than a equipment fault.

  4. 04

    Sediment buildup in tank

    Wiring / connection

    Mineral sediment accumulating at the bottom of the tank can insulate the water from the heat source, slowing recovery time and causing longer heating cycles. Flushing the tank can restore normal heat transfer efficiency.

  5. 05

    Unit undersized for demand

    Wiring / connection

    If the water heater's capacity or recovery rate is insufficient for the household's hot water needs, the thermostat will call for heat almost continuously during peak usage periods. This may require evaluating whether a larger unit is appropriate.

See the test procedure for each cause

Frequently asked questions about Heartbeat

What does Heartbeat mean on a Bradford White water heater?
The Heartbeat indicator means the thermostat has detected that the tank water temperature is below the set point and is calling for a heating cycle. This is a normal operational status, not an error or fault condition. The indicator will stop once the water reaches the target temperature. No repair or reset is needed.
How do I fix the Heartbeat status on my Bradford White water heater?
No fix is required because the Heartbeat indicator signals normal operation. If you want to reduce how often or how long the unit heats, you can adjust the thermostat to a lower set point. If the unit seems to heat continuously without ever satisfying, flushing sediment from the tank or reviewing your household hot water demand would be the appropriate next steps.
Is the Heartbeat indicator a safety concern on a Bradford White water heater?
No, the Heartbeat indicator is not a safety concern. It simply means the heater is actively in a normal heating cycle. Safety-related fault codes on Bradford White units are represented by different blink patterns or error codes, not the Heartbeat status.
Will resetting the water heater clear the Heartbeat indicator?
Resetting the unit is not necessary and will not prevent the Heartbeat indicator from returning, since it reflects a real operational condition rather than a stored fault. The indicator will clear on its own once the tank water temperature reaches the thermostat set point. Resetting the unit during an active heating cycle would simply restart the process.
How much does it cost to repair a Bradford White water heater showing the Heartbeat status?
Because the Heartbeat status indicates normal operation rather than a fault, there is typically no repair cost associated with it. If a technician visit determines that prolonged heating cycles are caused by sediment buildup or a failing thermostat, service costs can range from around 75 dollars to several hundred dollars depending on the parts and labor involved.

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