How to Fix Honeywell Temperature Sensor Failure 5 Flashes 

A honeywell temperature sensor failure with 5 flashes can be caused by a faulty sensor, loose or damaged wiring, or a malfunctioning control board. Possible solutions include testing and replacing the sensor or wiring, or replacing the control board if necessary.

What causes a temperature sensor to fail

Several factors can cause a temperature sensor to fail. Here are some common causes of temperature sensor failure:

Age: Over time, temperature sensors can degrade, become less accurate, or malfunction due to normal wear and tear. As sensors age, they may fail to provide accurate temperature readings, which can cause issues with the water heater.

Corrosion: Water heaters are prone to corrosion due to the constant presence of water. Corrosion can cause damage to the temperature sensor, leading to inaccurate temperature readings or sensor failure.

Physical damage: The temperature sensor can become physically damaged due to accidental impacts or mishandling during maintenance or repair.

Electrical problems: Electrical surges or voltage spikes can damage the temperature sensor and other components of the water heater, causing the sensor to fail.

Environmental factors: Exposure to extreme temperatures or moisture can also damage the temperature sensor and cause it to fail.

Read also: How to fix bradford white thermostat well sensor fault

How to test a Honeywell temperature sensor for continuity

If you suspect that you have a failed honeywell temperature sensor, you can test it for continuity. Here are the detailed steps on how to test a Honeywell temperature sensor for continuity:

Materials you will need:

  • Multimeter
  • Screwdriver


  • Turn off power to the water heater by shutting off the breaker or removing the fuse that powers it. This is important for safety reasons.
  • Locate the Honeywell temperature sensor on the water heater. It’s typically located near the bottom of the tank and is connected to the control board with two wires.
  • Remove the wires from the temperature sensor by using a screwdriver to loosen the screws holding them in place.
  • Turn on your multimeter and set it to measure continuity.
  • Touch the two probes of the multimeter to the two terminals on the temperature sensor. The multimeter should display a reading of zero ohms if the temperature sensor has continuity, which means it’s functioning properly. If the multimeter displays a reading of infinite ohms, then the temperature sensor does not have continuity and is faulty.
  • If the temperature sensor does not have continuity, it will need to be replaced. To do this, remove the old sensor by unscrewing it from the water heater and then install the new sensor in its place.
  • After the new temperature sensor is installed, reconnect the wires to the control board and tighten the screws with the screwdriver.
  • Turn on power to the water heater by flipping the breaker or replacing the fuse.
  • Test the water heater to make sure it’s functioning properly by checking for hot water and monitoring the temperature.

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How do I know if my thermostat sensor is bad

Temperature sensor is an important component of a Bradford White water heater that measures the temperature of the water in the tank and communicates that information to the control board to regulate the temperature. If the temperature sensor on your Bradford White water heater is malfunctioning or faulty, it can cause a variety of issues with the water heater. Some symptoms of a bad temperature sensor on a Bradford White water heater include.

Inaccurate temperature readings: A malfunctioning temperature sensor may provide incorrect temperature readings, causing the water temperature to be too hot or too cold, which can result in discomfort or even safety hazards.

Water temperature fluctuations: If the temperature sensor is faulty, it can cause the water heater to cycle on and off too frequently, leading to inconsistent water temperatures, which can be inconvenient and uncomfortable.

No hot water: If the temperature sensor is completely non-functional, it can prevent the water heater from heating the water at all, leading to no hot water.

Water that is too hot: A faulty temperature sensor can cause the water heater to overheat the water in the tank, resulting in scalding hot water that can cause burns or other safety hazards.

Error codes displayed on the control panel: Some Bradford White water heaters have error codes that display on the control panel if there is an issue with the temperature sensor. If you see any error codes, it’s important to address the issue promptly to avoid further problems.

See also: Bradford white water heater pilot light won’t light

How to reset a Honeywell temperature sensor

Here are the detailed steps to reset the Honeywell temperature sensor 

  1. Turn the Gas Control knob to the “OFF” position.
  2. Wait for a minimum of 5 minutes to allow any residual gas to dissipate.
  3. Locate the pilot burner and ensure that it is not lit. If it is still lit, turn off the gas supply to the unit and wait for it to cool down before proceeding.
  4. Once the pilot burner is out and the unit has cooled down, turn the Gas Control knob to the “ON” position.
  5. Follow the manufacturer’s instructions to relight the pilot burner and turn the unit back on.

How to Replace a honeywell temperature sensor

1. Rotate knob of the Gas Control to the “OFF” position. 

2. Turn off gas supply to water heater.

3. Disconnect gas supply line from Gas Control. Step 

4. Disconnect piezo igniter wire. 

5. Remove inner door assembly f. 

6. Remove Gas Control cover screw.

7. Depress both tabs on the top of the Gas Control cover and pull to remove

8. Disconnect temperature sensor from control board and remove wire from the temperature sensor wire routing clip.

9. Replace the defective temperarue sensor with a new one.


Q: What does it mean if my water heater displays an error code of 5 flashes?

A: An error code of 5 flashes on a Honeywell temperature sensor indicates a sensor failure or other issue with the sensor wiring or control board.

Q: How do I troubleshoot a Honeywell temperature sensor error?

A: Start by checking the wiring connections between the sensor and the control board to make sure they are secure and undamaged. If the wiring appears to be in good condition, test the sensor for continuity using a multimeter. If the sensor is faulty, it will need to be replaced.

Q: Can I replace the Honeywell temperature sensor myself?

A: Yes, you can replace the temperature sensor yourself if you have some basic DIY skills and tools. However, if you’re not confident in your ability to do so safely, it’s best to hire a professional plumber or HVAC technician to do the job.

Q: How do I know if the issue is with the control board rather than the sensor?

A: If you’ve ruled out wiring issues and the sensor tests okay for continuity, it’s possible that the control board is malfunctioning. A professional plumber or HVAC technician can diagnose the issue and determine if the control board needs to be replaced.

Read also: Bradford white electric water heater reset button location

Q: Can a faulty temperature sensor cause other problems with my water heater?

A: Yes, a faulty temperature sensor can cause other issues with your water heater, such as inaccurate temperature readings, water temperature fluctuations, or even no hot water at all.

Q: How can I prevent temperature sensor failure in the future?

A: Regular maintenance of your water heater can help prevent temperature sensor failure and other issues. Regular flushing and cleaning of the tank, checking the pressure relief valve, and replacing anode rods when necessary can all help to prolong the life of your water heater and its components, including the temperature sensor.

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