Takagi Tankless Water Heater Reset Button [Location & Usage]

Sometimes due to overload, overheating, or other internal issues, the Takagi tankless water heater can trip and stop working. In this case, you have to reset the unit to return it to its previous condition. However, locating and using the reset button can be confusing if you haven’t encountered this problem before. 

So, Takagi tankless water heater reset button – where to find it and how to use it? 

  • The Takagi tankless reset button is located on a computer board named INC and DEC. 
  • You have to press these buttons simultaneously to reset the unit. 
  • Depending on the model, these buttons can have different arrangements. 

From my years of experience, I can safely say that resetting the heater is the easiest job I had to do in the case of Takagi Tankless water heater troubleshooting. Read this article, and you will also be able to do it. 

takagi tankless water heater reset button

Takagi Tankless Water Heater Reset Button Location

The reset button in the Takagi tankless water heater is located on the computer board for both condensing and non-condensing models. 

If you look at the computer board of the Takagi Water Heater, you’ll see two buttons labeled INC (increase) and DEC (decrease). These are the special buttons that act as the reset button for this tankless water heater brand. So, if something goes wrong or there’s an error, these are the buttons you have to work with to reset the water heater.

Takagi Tankless Water Heater Reset Button Location for condensing model:

Some condensing models of Takagi tankless water heaters include: 

  • HX3 series 
  • H3 series
  • T-H3S series (Indoor and Outdoor) 
  • T-H3j series (Indoor and Outdoor) 
  • CX3 series 
  • 540P Indoor, 540P Outdoor
  • CT-199 Indoor, CT-199 Outdoor

In these models, the reset button is located on the computer board in the following arrangement. 

locate the reset button of takagi tankless water heater

Takagi Tankless Water Heater Reset Button Location for Non-condensing model:

Some popular non-condensing models of Takagi tankless water heater includes, 

  • 110 Indoor (T‐KJr2‐IN)
  • 110 Outdoor (T‐KJr2‐OS)
  • 310 Indoor (T‐K4‐IN)
  • 310 Outdoor (T‐K4‐OS)
  • 510 Indoor (T‐D2‐IN)
  • 510 Outdoor (T‐D2‐OS)

In these models, the reset button in the computer board is arranged in the way shown below. 

reset button in the computer board of takagi tankless water heater

In the next segment, we will learn how to use these buttons to reset Takagi tankless water heaters. 

How To Reset Takagi Tankless Water Heater? [Step-by-step Guidelines]

Although non-condensing and condensing models have a different arrangement of the reset buttons, the way of resetting the unit is similar for all the heaters. Here I will describe the whole process of resetting the Takagi tankless water heater. 

Step 1: Ensure Water Flow is Stopped

Before attempting to reset the Takagi Tankless Water Heater, make sure that water is not flowing through the unit. This step is a must to avoid any potential hazards during the reset process.

Step 2: Turn Off Temperature Remote Controller

If your water heater is equipped with a temperature remote controller, deactivate its power. This step is important to ensure that the unit is not receiving any commands during the reset.

Step 3: Power Off the Tankless Unit

Locate the power switch on the Takagi Tankless Water Heater and switch it off. Wait for a few seconds, and then turn the power back on. This action prepares the unit for the reset procedure.

Step 4: Remove the Front Access Panel

After making sure the water heater is safe to work with you need to access the reset button. To access the reset buttons, you need to remove the front access panel of the water heater. 

This panel in the Takagi tankless water heater is located on the front side of the unit. Use a screwdriver or the adjustable wrench to carefully take off the panel.

Step 5: Locate Reset Buttons

Once the front access panel is removed, find the computer board inside. Look for two reset buttons labeled “INC” and “DEC” on the computer board. These buttons are integral to the reset process. I have already shown the location of these buttons in the previous segment. 

Step 6: Press and Hold the Buttons

Simultaneously press and hold both the “INC” and “DEC” buttons on the computer board for a few seconds. Continue holding them until you observe a red LED light illuminating. This indicates that the reset process is in progress.

Step 7: Release Buttons and Power Off Unit

After the red LED light appears, release both the “INC” and “DEC” buttons. Subsequently, turn off the Takagi Tankless Water Heater using the power switch.

Step 8: Power On the Water Heater

With the unit turned off, wait for a moment, and then turn the water heater back on. You should notice that the water heater has been successfully reset. The unit is now ready to resume normal operation.

Now the Takagi tankless water heater is reset and ready to use again. 

How To Reset Takagi Tankless Water Heater Hi-Limit Switch?

Sometimes, due to flame loss or other problems in the ignition process of the Takagi tankless water heater, you can notice error codes in the Takagi water heater like 121 or 111 with three flashes. In these cases, most of the time the main culprit is the hi-limit switch. 

The high-limit switch in a water heater is a safety feature designed to prevent the water temperature from reaching dangerously high levels. Sometimes, when the water temperature exceeds the preset safety limit, this switch trips.

In this case, you have to reset the hi-limit switch in the Takagi tankless water heater. Resetting the high-limit switch on a Takagi Tankless Water Heater is a straightforward process. Here’s the process of doing it. 

Step 1: Turn Off Power to the Unit

First, locate the power switch situated near the unit, and switch it to the “off” position. This precautionary step is essential to guarantee safety during the reset process.

Step 2: Locate the White Reset Button

Open the control panel and look for the white reset button on the water heater unit. This button is designed to reset the high-limit switch and is usually easily identifiable.

location the high-limit switch of takagi tankless water heater

Step 3: Push the White Button In

Press and hold the white reset button. Apply steady pressure until you hear and feel a distinct click. This click indicates that the high-limit switch has been successfully reset. The button is designed to trip when the water temperature exceeds safe levels, and pushing it in resets the switch to its normal position.

Step 4: Turn Power Back On

Once you have reset the high-limit switch by pushing the white button, turn the power back on. Locate the power switch and switch it to the “on” position. This restores power to the water heater.

Step 5: Test the Heater

After restoring power, test the Takagi Tankless Water Heater to ensure it is functioning properly. If the unit fires on, it indicates that the high-limit switch has been successfully reset, and the water heater is ready to operate.

Step 7: Contact the Technical Service Department

If the tripping of the hi-limit switch issue persists, it is recommended to contact the Takagi Technical Service Department for further assistance. Provide them with information about the problem, and according to their manual, they can offer specialized technical support to address the issue.

How To Reset Takagi Tankless Water Heater  T-K1 Model?

Some Instantaneous Water Heater by Takagi such as the T-K1 model has a different resetting system. Sometimes, due to the reset button tripping, these water heaters stop working. However, there are some other reasons why the heater can stop working such as flow rate issues and flow sensor problems. 

If troubleshooting these doesn’t work, you have to go for resetting the unit. Here’s how to do it. 

Step 1: First, find the Ground Fault Circuit Interrupter (GFCI) inside your water heater unit. It has a lower green button and a red light above it.

Step 2: After locating, press the lower green button. If the red light above it doesn’t come on, there might be an issue with the electrical supply to the unit.

Step 3: Check the Red Light. If the red light doesn’t come on, there’s an electrical supply problem. You may need to examine your electrical connections or consult with an electrician to address the issue. If the red light above the lower green button is on, it’s a good sign. Press the green reset button above the light.

Step 4: Look for the Small Red LED. After hitting the reset, check for a small red LED in the lower hole in the middle of the T-K1 circuit plate. If this LED isn’t lit, there may be a problem with the electrical connection between the GFCI and the circuit plate.

Step 5: If the small red LED is not lit or if you encounter any issues during the process, it’s recommended to get in touch with Takagi Industrial Company for specific instructions. They can guide your situation.

FAQs:

What happens when you reset a water heater?

When you reset a water heater, you interrupt power briefly and restore it. This action resets safety features and may address issues like overheating. It allows the heater to resume normal operation, provided there are no underlying problems requiring further attention.

What is the high-limit reset button on a water heater?

The high-limit reset button on a water heater is a safety feature designed to trip and cut off power when the water temperature exceeds a safe limit. It prevents overheating, which could lead to damage or pose safety risks.

Why do I have to keep resetting my tankless water heater?

If you have to keep resetting your tankless water heater, it indicates issues such as overheating, extremely hot water, faulty components, electrical problems, or gas supply issues. Identifying and addressing the root cause is important for consistent performance.

Should I reset the water heater?

Resetting a water heater is appropriate when troubleshooting issues like a tripped high-limit switch. However, if you have to keep resetting the water heater frequently, it’s not a good sign and you should consult a professional.

Conclusion: 

Here is everything you need to know about the Takagi tankless water heater reset button and its usage. I hope after reading this article, you can easily locate the reset button in your heater and use it. 

If you have to reset the unit again and again, it’s not a good sign and you should consult the Takagi dealer. 

That’s all for now. Have a great day. To know more about water heater maintenance, you can read our article on Takagi water heater dip switch settings.

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