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Error code reference

Bradford White Water Heater Error Code 14

Thermal fuse has activated due to excessive heat exchanger temperature.

Bradford White codesBradford White water heater codes

Thermal fuse has activated due to excessive heat exchanger temperature.

First step from the service manual

Ensure dip switches are set to the proper position. Ensure high fire and low fire manifold pressure is correct. Check gas type of unit and ensure it matches gas type being used. Check heat exchanger for cracks and/or separations. Check resistance on safety circuit.

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

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What 14 means on a Bradford White water heater

Error code 14 on a Bradford White water heater indicates that the thermal fuse in the safety circuit has activated due to excessive heat exchanger temperature. The thermal fuse is a one-time, non-resettable safety device designed to open the safety circuit when temperatures exceed a safe threshold at the heat exchanger. Once the fuse opens, the control board detects the break in the safety circuit and locks out operation to prevent further heat buildup, structural damage, or combustion hazards.

The most common root causes of this fault involve combustion and gas delivery problems that cause the heat exchanger to run hotter than intended. Incorrect dip switch settings can cause the unit to fire at the wrong rate for the installation, leading to excess heat accumulation. Similarly, improper manifold pressure during high fire or low fire operation can cause incomplete or excessive combustion. A mismatch between the gas type the unit is configured for and the gas type actually being supplied is another significant contributor, as this directly affects the BTU output and flame characteristics.

Physical damage to the heat exchanger also plays a critical role. Cracks or separations in the heat exchanger can disrupt the normal flow of combustion gases, trapping heat in areas that exceed the thermal fuse rating. Diagnosing this fault requires confirming dip switch positions, verifying manifold pressures against rated specifications, matching the gas type configuration to the supply, inspecting the heat exchanger for physical defects, and measuring resistance across the safety circuit to confirm whether the thermal fuse has opened or if another component in the circuit is responsible.

Source: manufacturer service documentation.

Common causes of 14

  1. 01

    Incorrect dip switch settings

    Wiring / connection

    Dip switches configure the unit for firing rate and installation type. If set incorrectly, the burner may operate at the wrong output level, generating excess heat at the heat exchanger and triggering the thermal fuse.

  2. 02

    Improper manifold gas pressure

    Wiring / connection

    High fire or low fire manifold pressure that falls outside the specified range can cause over-firing or abnormal combustion, driving heat exchanger temperatures above the thermal fuse threshold. Pressure must be verified with a manometer during operation.

  3. 03

    Gas type mismatch

    Wiring / connection

    If the unit is configured for natural gas but supplied with propane, or vice versa, combustion characteristics change significantly and can produce excessive heat. Confirm the gas type label on the unit matches the supply being connected.

  4. 04

    Cracked or separated heat exchanger

    Part replacement

    Physical damage such as cracks or separations in the heat exchanger can disrupt normal combustion gas flow, concentrating heat in localized areas and causing temperatures to spike beyond safe limits. A visual inspection is required to identify this condition.

  5. 05

    Open thermal fuse requiring replacement

    Part replacement

    Once activated, the thermal fuse does not self-reset. Resistance testing across the safety circuit will confirm if the fuse has opened. Even after the root cause is corrected, the fuse itself must be replaced before the unit can operate again.

See the test procedure for each cause

Frequently asked questions about 14

What does 14 mean on a Bradford White water_heater?
Error code 14 means the thermal fuse in the safety circuit has activated because the heat exchanger reached an excessively high temperature. The control board detects the open safety circuit and locks out the unit to prevent further damage or hazard. The fault can be caused by incorrect dip switch settings, improper gas pressure, a gas type mismatch, or a cracked heat exchanger. The unit will not operate again until the root cause is corrected and the thermal fuse is replaced.
Can I reset a Bradford White error code 14 myself?
A simple reset will not clear error code 14 because the thermal fuse is a one-time safety device that physically opens and cannot be reset electronically or manually. The underlying cause of the overheating must be diagnosed and corrected first. After that, the thermal fuse component must be physically replaced before the unit will resume normal operation. Attempting to bypass the safety circuit is not safe and could create a serious hazard.
Is it safe to use my water heater when error code 14 is displayed?
No, the water heater should not be used while error code 14 is active. The code indicates the heat exchanger reached dangerous temperature levels, which could point to a combustion problem, a cracked heat exchanger, or an incorrect gas configuration. Continuing to attempt operation without resolving the cause could result in equipment damage or a safety hazard. Keep the unit off until a qualified technician has inspected and repaired it.
How much does it cost to repair a Bradford White error code 14?
Repair costs vary depending on the root cause. If the issue is only a dip switch or gas pressure adjustment, labor costs alone may be in the range of $75 to $200. If the thermal fuse needs replacement in addition to a gas system correction, parts and labor could total $150 to $400. A cracked heat exchanger is the most expensive scenario, potentially reaching $400 to $900 or more depending on parts availability and labor rates in your area.
What should a technician check first when diagnosing error code 14 on a Bradford White water heater?
The first steps are to verify that the dip switches are set to the correct positions for the installation, and to confirm that both high fire and low fire manifold pressures match the rated specifications using a manometer. The gas type configured on the unit should also be compared against the actual gas supply to rule out a mismatch. After those checks, the heat exchanger should be inspected for cracks or separations, and resistance should be measured across the safety circuit to confirm whether the thermal fuse has opened.

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