Rinnai Tankless Water Heater Beeping

Rinnai Tankless Water Heater Beeping [9 Easy Solutions]

Do you fail to figure out the reason behind the beeping noise of your Rinnai tankless water heater? If yes, you are not alone. 

Like you, I also experienced this issue. Rinnai water heater will beep once it detects a problem within the water heater and alarms you by flashing an error code. The beeping noise will not stop until you fix the issue. 

And Today’s article will reveal the reason behind the beeping noise of your Rinnai water heater. Plus, I will disclose the meaning of the error codes responsible for making the beeping sound. As a result, you can clear the error code and stop the annoying beeping noise. 

So, let’s get started without a second delay. 

Table of Contents

Why Is My Rinnai Tankless Water Heater Beeping?

Your Rinnai Tankless Water Heater will beep and throw an error code on the controller display to let you know there is an issue within the unit. 

The beeping noise will alert you and indicate it requires your attention to fix the issue. Fault codes (which are responsible for the beep) on the Rinnai water heater generally range from error code 03 to 79. 

But I will break down only those error codes that are often to blame for the beeping noise.

Here we go.

01. Rinnai Tankless Water Heater Beeping LC

Beeping code LC on your Rinnai water heater indicates there is a scale or lime buildup in the heat exchanger. Your water heater will continue to flash and beep this code until you flush your water heater. If you don’t flush the unit, it will damage the heat exchanger. 

How To Fix: 

The only solution to this issue is to flush the tankless water heater. Fortunately, this guide on Rinnai Tankless Water Heater Flush compiled a list of 5 easy flushing procedures. So, check that article and learn how to flush the Rinnai water heater. Alternatively, you can hire a professional to do this task for you if you aren’t comfortable with it. 

02. Rinnai Tankless Water Heater Beeping 10

If your water heater flash and beep the error code 11, understand air supply, exhaust, and condensate trap get clogged. This fault code will also appear if: 

  • Condensate line gets blocked
  • Obstructions in the internal air filter 
  • Combustion air and exhaust vents get restricted by dirt and debris
  • Vent length is not within limits
  • Fan gets blocked by debris and the wheel doesn’t spin freely
  • Check valve gets stuck between fan casing and burner body

How To Fix: 

Inspect the condensate line, air filter, and exhaust vents for blockage. If you find any restriction there, release the blockage. I have already covered a guide on Rinnai Tankless Water Heater Code 10. You can find there how to inspect and clean those areas that will help you clear the error code 10 from the display. 

03. Rinnai Tankless Water Heater Beeping 11

Error code 11 on the Rinnai water heater is pointing to the ignition issue. Generally, the following reasons are responsible for ignition failure: 

  • Gas isn’t turned on at the water heater, meter, and gas tank.
  • Propane tank is empty (if it’s a propane unit)
  • Air in the gas line
  • Incorrect fuel type and gas supply pressure
  • Defective igniter 
  • Damaged or loose flame rod wire

How To Fix: 

First off, ensure the gas is flowing to the unit, meter, and gas tank. If the gas is turned off, just turn it on. 

Secondly, make sure there is sufficient gas in the propane tank. If needed, fill the tank with gas from your local gas station. 

Next, check the manual and see whether the unit you have is operated by natural gas or propane. Then, ensure you fuel up your water heater with the right type of gas. Also, don’t forget to check the gas supply pressure. 

Apart from these, inspect the igniter and replace it if needed. Sometimes loose flame rod wiring can also be the culprit behind this issue. So, check this wire and tighten it up if required. 

I highly recommend you check this article on Rinnai Tankless Water Heater Code 11 where I described everything in detail so that you can clear this code. 

04. Rinnai Tankless Water Heater Beeping 12

When your Rinnai tankless water heater fails to detect a flame, it will throw the error code 12. Here are some reasons that cause your water heater to beep and flash this error message: 

  • Gas is not flowing to the unit
  • You may not purge the gas lines
  • Loose flame rod wire
  • Wrong gas supply pressure 

How To Fix: 

Check this guide on Rinnai Tankless Water Heater Code 12 to discover the solution to this issue. 

05. Rinnai Tankless Water Heater Beeping 17

Your Rinnai Tankless water heater will beep the error code 17 when the venturi gets clogged by dirt and debris. It won’t stop the beeping noise until you free up the blockage from the venturi. 

How To Fix: 

Cleaning the venturi is not a piece of cake. So, it will be better if you hand over this venturi cleaning task to a professional. In other words, call the Rinnai technical department or a certified plumber to clean the venturi for you.

06. Rinnai Tankless Water Heater Beeping 25

Condensate pump failure or failure to its accessory causes the tankless water heater to beep the fault code 25. The reasons described below are responsible for this water heater issue: 

  • Blocked condensate drain line
  • Blockage in the condensate trap and tank inside
  • Loose or broken sensor wiring harness
  • Restricted condensate reservoir 
  • Defective condensate pump 

How To Fix: 

Start with checking the condensate drain line for a clog. In this case, remove the condensate drain line and use an air compressor to blow away the blockage from the drain tube. 

Next, take a look at the condensate trap and the tank inside. If there is any restriction, drain the condensate trap using the condensate drain port on the bottom of the unit. 

If you find it difficult to clean the condensate trap or its reservoir, call a qualified technician for help. 

Also, don’t hesitate to reach out to a professional to inspect the condensate pump.

07. Rinnai Tankless Water Heater Beeping 65

The beeping code 65 on Rinnai tankless water heater indicates the water control valve is at fault. Generally, your Rinnai water heater will pop up this error message for the following reasons: 

  • Loose or broken wiring to the water control valve
  • Defective water control valve 

How To Fix: 

Firstly, inspect the wiring that runs from the water control valve back to the PC board. If you notice any visual damage or the wiring gets cracked, you must replace the wiring. 

Next, check the water flow control valve. If you find it challenging to close this valve during the bath fill function, understand it’s bad. Regarding this, turn the unit off immediately and call a professional to solve this issue. 

08. Rinnai Tankless Water Heater Beeping 79

When the unit detects a water leak, the Rinnai water heater will beep and flash the error code 79. These culprits cause the tankless hot water heater to display the error message: 

  • The wiring of the leak detector comes loose or gets damaged
  • Heat exchanger and its internal piping may leak water 
  • Defective sensor 

How To Fix: 

You can inspect the wiring of the leak detector. Just visually check the leak detector wiring and see whether it has any sign of damage or not. If yes, replace it with a new one. 

It’s typical to troubleshoot the heat exchanger and its internal piping for a leak. So, it will be best if you call a professional and let him do it for you. 

And lastly, replace the sensor if the tankless water heater is operating without the sensor. 

09. Rinnai Tankless Water Heater Beeping No Error Code

Does your Rinnai tankless water heater make a beeping noise but no code appears on the display? If this is the issue you are experiencing, I bet the following reasons are to blame: 

  • Not getting the flow rate the unit requires to fire
  • Defective water flow control sensor 
  • The inlet water supply filter gets clogged 
  • Cold and hot water lines may get reversed 

How To Fix: 

Every water heater requires a certain amount of water flow to fire up. If the flow rate is lower than the recommended water flow, you can’t ignite the unit. So, check the manual to see the ideal flow rate and adjust it according to the manual. If needed, call a professional for help. 

Next, replace the water flow control sensor if it’s at fault. Then, examine the inlet water supply filter for restrictions and free it up if there is any blockage. 

Lastly, make sure the cold water line and the hot water line are in the correct place. 


The beeping code on Rinnai tankless water heater makes it easy to troubleshoot the unit. If you know the meaning of the error code, you can take the initial action against the problem. Fortunately, I broke down everything you need to know about the beeping code. 

Also, I discussed what troubleshooting steps you should follow to clear the error message, which will ultimately stop the beeping noise as well. So, follow every troubleshooting step for a specific issue and solve the problem. Good Luck!

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *