Why is my Rinnai tankless water heater beeping (reasons and solutions)?

Can’t you understand why your Rinnai tankless water heater is beeping? You are not solitary. Such as you, I also ran with this problem. The Rinnai water heater will signal as shortly as it sees trouble in the water heater and will warn you by winking an error code. The signal will not quit until you resolve the issue.

Why is my Rinnai tankless water heater beeping (reasons and solutions)?

This post will reveal the reason for the signal of your Rinnai water heater. As well as, I will demonstrate the essence of the error code accountable for the sound horn. As a consequence, you might remove the error code and prevent the irritating signal sound. So, allow the beginning!

Why is my Rinnai tankless water heater beeping?

Why is my Rinnai tankless water heater beeping (reasons and solutions)?

Here is a recap of the multiple joint reasons for your Rinnai tankless water heater beeping.

Rinnai tankless water heater beeping with error code LC

The LC signal error codes on your Rinnai water heater show the existence of scale in the heat exchanger. Your water heater will proceed to blink and signal this error code until you wash the water heater. Refusal to wash the aggregate will hurt the heat exchanger.

How to correct

The sole explanation for this issue is to wash the tankless water heater. You may employ a skilled to do this job for you if you don’t want it.

There is a leak sensor in the system

The leakage of water in the system may trigger the leakage sensor and cause an audible notice. You may also notice an error code on the screen.

How to correct

If you think there can be a water leakage, switch off the ability to the water heater in the junction box and call a plumber immediately. If you are confident that you will undertake this repair, the first step is to use a tester to create certain that the water heater is not receiving energy.

You will then need to identify and fix the source of the leak sensor, which usually involves soldering or replacing the pipe. Once this is done, you can turn the power back on and see if the leak and beeping stop.

Rinnai tankless water heater beeping with error code 10

Why is my Rinnai tankless water heater beeping (reasons and solutions)?

Blocking the air supply or exhaust.

How to correct

Make sure that Rinnai-recommended ventilation materials are used. Make sure there are no obstructions in the vent system. Moreover, make sure the length and diameter of the vent are within the proper limits and clearances. With a probability of 95%, the problem is due to improper installation of the ventilation pipe.

Sound signal Rinnai tankless water heater with error code 11

Why is my Rinnai tankless water heater beeping (reasons and solutions)?

Error code 11 on a Rinnai water heater means trouble with the striking. As a reign, the reason for ignition failure is the next cause:

  • Gas does not swift on at the water heater, counter, and gas tank.
  • The propane balloon is blank.
  • The air supply in the gas pipeline.
  • Wrong fuel type and gas delivery pressure.
  • Defective igniter.
  • Broken or lax flame wire.

How to correct

Primarily, create certain that gas is delivered to the apparatus, counter, and gas tank. If the gas is off, simply need it to turn on.

After, make sure you have sufficient gas in your propane balloon. If required, refill the balloon with propane at a gas station.

Then review the manual and notice if your appliance operates on propane or natural gas. Also, don’t overlook checking the gas delivery pressure.

Besides, check the igniter and substitute it if required. Occasionally, lax flame rod wiring may too be the reason for this issue. So, review this wire and constrict it if required.

The Rinnai tankless water heater is overheating

If the instantaneous water heater overheats, it will automatically turn off and beep to alert you to the problem. Overheating can be caused by a number of things, including a clogged vent or the build-up of deposits in a tankless water heater.

The telltale sign of a water heater overheating is a display that shows an error code indicating a high temperature.

How to correct

If your Rinnai instantaneous water heater is beeping due to overheating, you must turn off the power to the water heater immediately, or you risk damaging the unit beyond repair. Once that’s done, you can check the vent to see if it’s blocked. If so, clear the blockage and turn the power back on.

If that doesn’t work, it’s likely that sediment has built up inside the water heater. This is often the case with tankless water heaters, which you need to clean up regularly, especially if you have hard water.

Tankless water heater error code 12

Flame failure.

How to correct

Assuming the gas type and pressure are correct and there is no air in the gas line or other problems with the gas supply, check that: there are no loose connections on the circuit board, power supply or flame rod, or gas solenoid valve has no short circuit, there are no obstructions in the vent system, and the gases exit correctly.

Clean the flame rod from the scale, and the burners from debris and dirt.

Sound signal tankless water heater Rinnai with error code 17

Your Rinnai tankless water heater beeps with error code 17 when the venturi is clogged with dirt and debris. This will not stop the horn until you release the venturi blockage.

How to correct

Cleaning the venturi is not an easy task. Therefore, it will be better if you leave this venturi cleaning task to a professional. In other words, call the Rinnai technical department or a certified plumber to have the venturi cleaned.

Too low water consumption

Why is my Rinnai tankless water heater beeping (reasons and solutions)?

Low water pressure is another common issue with Rinnai tankless water heaters and is usually caused by a problem with the water supply line, such as a blockage. And it’s usually fairly easy to diagnose, as tap water flow will be noticeably lower than normal.

So, why does your Rinnai water heater beep when the water pressure is too low? This is because tankless water heaters require a certain water flow rate to work properly.

Choosing the right water flow rate for your tankless water heater depends on your usage level. The more hot water you need, for example, if you have a large family, the more flow you will need.

Similarly, if you live alone, you can easily get by with a lower flow rate. If the flow rate is not as expected, the device will overheat and shut down.

How to correct

If the water pressure is too low, the water supply line must be checked first. Make sure there are no blockages. If everything looks good, the next step is to take a closer look at the water pressure regulator.

The water pressure regulator is usually located near the main water shut-off valve.

If it is set too low, it can lead to water pressure problems. Just adjust the regulator and see if that solves the problem.

Rinnai water heater with error code 14

Faulty thermal fuse or overheating.

How to correct

Make sure that there are no obstructions in the ventilation system or around the device. Make sure that there are no obstructions in the hot water supply system, as a sufficient amount of cold and hot water must flow through the heat exchanger. Make sure the heat exchanger is in proper working condition.

Sound signal water heater Rinnai tankless with error code 25

A malfunctioning condensate pump or failure of its accessories causes the instantaneous cold and hot water heater to sound an alarm with error code 25. This heater malfunction is caused by the reasons described below:

  • Clogged condensate drain line.
  • Clogged condensate trap and tank inside.
  • Loose or broken sensor harness.
  • Limited condensate tank.
  • Faulty condensate pump.

How to correct

Begin by inspecting the condensate drain line for stoppages. In this issue, take off the condensed plum line and operate an air compressor to bumble out the stoppage from the drain tube.

Subsequently, bring a glance at the condensate line and the reservoir within. If there is any requirement, pour off the condensate via the condensate plum spot at the base of the aggregate.

If you see it hard to cleanse the condensate line or its waterhole, seek the help of a skilled repair person.

Error code 52

Modulating solenoid valve (POV) signal failure.

How to fix

Check for loose, damaged, or broken connections on the POV valve. Check the resistance readings to make sure they are within specifications. Check the voltage at the POV valve when the device tries to ignite. If you get the correct voltage and the error code remains, replace the circuit board.

What temperature should Rinnai be set to?

The temperature of the Rinnai tankless water heater must be 120 degrees Fahrenheit to avoid scalding the bath water. However, some users can increase the temperature up to 140 degrees Fahrenheit if desired. To complete this task, follow these steps:

  • Disconnect the water heater from the power source.
  • Unscrew the front cover.
  • Locate DIP switch #6 and set it to the “on” position. You may need a small screwdriver for this step.
  • Replace and secure the front cover. Then restore power to the water heater.

Users should be aware that prolonged bathing in hot water may cause health problems. Some of these risks include dry skin and a lowered immune system. In addition, it is reasonable to turn on the hot water heater for an average of only 3-5 hours a day.


Why is my Rinnai tankless water heater beeping?

The water heater may sound an alarm to warn of a water leak. Leaks can be obvious if the floor next to the water heater is wet, but the leak could also be somewhere along the line. The sound signal can be triggered by the water heater shutdown function, and flood prevention device. An audible alarm can also signal a gas leak.

How do I silence my Rinnai alarm?

To turn off the sound (mute), press and hold the device buttons until a beep sounds, approximately 5 seconds.


Errors are usually the culprit for Rinnai tankless water heaters beeping constantly. The error codes displayed on the screens of these plumbing fixtures should indicate the sources of these problems.

Applying proper troubleshooting and repair techniques can help Rinnai water heater owners get these back in proper working order.

If you need to read about what causes too much pressure in hot water heaterplease read our article.

Robert Brooks

I have an engineering background. I have my own house, where I live with my wife and children. I want to say that the most important thing when equipping a house is to choose the right heating, ventilation, and air conditioning systems.

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