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Reasons Why Your Tankless Water Heater Is Beeping

Reasons Why Your Tankless Water Heater Is Beeping

Do you just hear a beeping noise from your tankless water heater?

If your tankless water heater is beeping, there’s a good chance that you’re wasting a lot of water and energy. There’s also a good chance that if it’s beeping, it’s beeping for more than one reason.

That’s where this guide comes in to help you identify the issue.


There are many reasons why your tankless water heater beeps. The beep is a warning sign to inform everyone that your tankless water heater needs attention.

Don’t ignore the warning and deal with cold showers. Here is a guide to explain why your tankless water heater is beeping.

  1. The water heater is in energy-saving mode.
  2. The water temperature is incorrect.
  3. Remote Controller is not properly connected.
  4. The water filter needs to be replaced.
  5. The child lock function locks the tankless water heater.

Tankless water heaters are high-tech and complex, but they aren’t hard to manage if you know what to do.

With this guide, you can figure out the reason why your water heater is beeping and fix it.

Many of us have experienced a tankless water heater beeping. If you’ve had this happen to you, odds are it’s not good news.

This article will explain ten reasons why your tankless water heater is beeping.

Why Your Tankless Water Heater Is Beeping

Ever had a beeping tankless water heater? If you answered yes, the good news is that there are many reasons why your tankless water heater could be beeping.

Each beep has a separate meaning, as specified by the manufacturers.

Here are ten reasons why your tankless water heater is beeping:

1. Gas Leak

Gas Leak

If you hear a loud beeping sound from your tankless water heater, there is a good chance of a gas leak in your home.

This can happen if there is damage to the valves on your tankless water heater or a crack in one of the pipes within your home.

You should turn off all of the gas appliances in your home and contact an HVAC professional as soon as possible.

Check your tankless water heater if you smell gas in your home and no appliances are running. Or, if it has been raining recently, check around the bottom of the unit for any signs of moisture or dampness.

If everything looks dry, then it’s probably not a gas leak.

2. Faulty PCB Board

Faulty Pcb Board

The other common reason your tankless water heater could be beeping is a faulty PCB board. This is the control unit that regulates all of the functions of a tankless water heater. If it is not working properly, it can cause many problems such as this one.

To fix this problem, you will need to replace the PCB board with a new one. It is important to note that if you do not have any experience with wiring or electrical work, then you should hire a professional instead of trying to do this yourself.

This is because there could also be other issues with your system, and further damage may occur if you try fixing it on your own without knowing what you are doing.

3. Sediment Buildup Beeping

Sediment Buildup Beeping

There are two main causes for sediment buildup in a tankless water heater. The first is that the water has not been used for some time, and the second is that there is too much sediment.

The latter can be caused by poor maintenance or a bad condition of the water supply. Sediment can build up in the burner chamber and affect your unit’s operation.

The beeping noise will stop once you drain all the water from your tankless water heater. This can be done by turning off the power and unplugging the unit before draining it manually with a hose.

After doing this, make sure to flush out all the pipes and faucets and any other appliances connected to them.

4. Low Water Flow Level

Low Water Flow Level

If your water pressure is too low or something blocks the flow of water to your tankless unit, it will error out and alert you.

To fix this issue, turn off all house faucets except one or two at a time to see if that fixes the problem.

If turning off some faucets does not help, try turning off all the faucets in the house and wait a few minutes before turning them back on again.

You can also check for leaks in your piping system by using food coloring in a water bottle to find where leaks may be coming from.

Another thing you can do is install an inline filter on each shower head, or wherever there may be low pressure, for additional protection.

5. Overheating Temperature

Overheating Temperature

If your tankless water heater is beeping, it could be due to the overheating temperature. If your tankless water heater’s temperature goes up to 150 degrees Fahrenheit or more, it will start beeping.

This safety feature is designed to let you know there is an issue with your tankless water heater. Overheating can have many causes, such as low water pressure and dirty plumbing lines or fittings.

The other reason for this is that there is insufficient airflow to cool down the unit. This can happen if other appliances are running on the same circuit or if there are problems with your home wiring.

In order to fix this issue, you need to check your home’s wiring and see if there are any issues with it.

You will also need to ensure that all of your appliances are working since they may also be causing an overload on the circuit board in your home.

6. Manufacturer Beeping

Manufacturer Beeping

Manufacturers of tankless water heaters use different sounds to indicate different problems. Some manufacturers use a single beep to indicate an issue, while others use multiple beeps to indicate different issues.

The best way to determine what your specific unit is trying to tell you is by checking the manual or contacting the manufacturer directly.

This beeping is because the manufacturer is reminding you to service it. It’s in your best interest to follow these reminders, as they can help prevent costly repairs and prolong the life of your equipment.

7. Low Gas Pressure

Low Gas Pressure

You could have low gas pressure if you have a gas-powered tankless water heater. When this happens, the flame will not burn as strongly as it should and will not heat up the tank as fast as it should.

To solve this problem, you must first check whether enough gas comes from your gas source. If not, then you need to turn off the gas supply and wait for about 10 minutes before turning it back on.

Once you turn it back on, make sure that it stays on for at least 5 minutes before shutting it off again.

8. Scale Buildup Beeping

Scale Buildup Beeping

One of the most common reasons for a tankless water heater to beep is scale buildup around the temperature sensor.

Scale is a thin layer that forms on the heating element, making it more difficult to heat water. If your heater is beeping, you should check your water heater’s manual to see if it has a scale alert feature.

As you use more hot water from your tankless water heater, calcium and other minerals build up around the sensor.

This will eventually make it difficult for the device to accurately read temperatures in its system.

When this happens, your tankless water heater will start beeping to let you know there’s an issue that needs to be addressed immediately.

You can clean off your furnace’s burner by using an acid-free cleaner and then wiping down the burner with a non-abrasive cloth or paper towel.

9. Burned Connector

Burned Connector

If your tankless water heater has a burned connector, it will make a series of beeping sounds. A burned connector usually happens when the device is left on too long and overheats its wiring.

The wires get so hot that they melt and short out, causing a loud buzzing noise and sparks in the unit.

This can also occur when the wires in the electrical connection come into contact with each other and create excessive heat. If this happens, you will hear a buzzing sound and visible sparks coming from the unit.

Key Takeaway

The best way to fix this problem is to call an electrician and have him, or her rewire the unit.


Never fix the wiring if you do not know what you are doing.


Touching live electric wires may cause serious injuries to you or even death.

10. Ventilation Problem

Ventilation Problem

If you don’t have proper ventilation in your home’s crawl space or attic, this can also cause problems for your tankless unit.

A ventilation problem will cause excess moisture to build up inside the unit and lead to corrosion of parts and components within the system, which could cause damage over time or make it unsafe for use altogether.

It will also allow mold and mildew growth on surfaces around where the unit is installed, which could cause performance problems.

Check for any signs of moisture inside or outside your home. If possible, fix any moisture issues before proceeding with any further troubleshooting efforts.

Ensure your ventilation pipe has an unobstructed path from outdoors to indoors and vice versa. If necessary, remove furniture or other objects blocking this area to improve airflow around the appliance.

Also, make sure there aren’t any leaks anywhere along this pipe. It should be completely dry and secure at all times.


Tankless water heaters are a great alternative to tank-type water heaters. They are more energy efficient and overall cheaper to own and operate. However, that does not mean that there won’t be minor problems and difficulties at times.

One of the major drawbacks of owning a tankless water heater is that you need to hear its beeping sound from time to time when it needs attention or maintenance.

Luckily, this article has outlined the ten reasons why your tankless water heater is beeping. It could be the manufacturer’s beeping, gas leak, or even low water flow level. Whichever the reason, the beeping will communicate to you.

Frequently Asked Questions

What Does It Mean When a Heater Beeps?

When your heater beeps, it means that there is a problem with your tankless water heater.

There are many reasons why your heater could beep, including the following:

  • The unit has exceeded its temperature limit.
  • The sensor is damaged or malfunctioning.
  • There may be an obstruction in the gas line or pilot assembly.
  • You may have a faulty gas valve or thermocouple.

How Do I Reset My Tankless Water Heater?

As with any appliance, there may be times when you need to reset it.
It’s easy to do; just follow these steps:

  • Turn off the power supply to your tankless water heater and wait 2 minutes before turning it back on.
  • Press the reset button on the side of the unit. If this doesn’t work, try unplugging the unit for 30 seconds and plugging it back in.

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