Pentair Heater Error Code R13 [Reasons + Solutions]

The Pentair heater error code R13 typically appears when there is a heater startup issue. The heater won’t work and the R13 code will be displayed when the heater is turned on until the issue is solved.

Now, this R13 error code usually appears due to a faulty membrane pad, a damaged service heater, and water flow problems.

pentair heater error code R13

On top of that, temperature settings and improper gas flow also contribute to the issue. Keep on reading to know about the issues and their solution in detail!

Pentair Heater Error Code R13 [Reasons + Solutions]

Each and every issue that causes the R13 code on the Pentair pool heater can be resolved within a few easy steps. Here, we will talk about the issues and how you can fix them.

Note: You can also read how to fix the Pentair Heater error codes problem.

1. Faulty Membrane Pad

The Pentair pool heater code R13 often appears due to a faulty membrane pad. Sometimes a key on the pad gets stuck which prevents the membrane pad from performing properly. This results in a pool heater startup issue due to which the R13 code appears.

How To Fix It:

Open the control panel of the Pentair pool heater and check the membrane pad to see whether it is performing properly or not. Make sure that you turn off the main connection of the heater before opening the panel.

If there is any problem with the membrane pad, repair or replace it to solve the problem. Restart the pool heater to see whether the R13 error code appears and the heater works properly.

2. Damaged Service Heater

The service heater is the main part of a pool heater and the heater won’t work if the service heater is damaged. The water won’t heat up and will cause the Pentair heater R13 error code to appear.

How To Fix It:

Turn off the main connection to the heater and check the service heater to ensure that it is offering the expected performance. Make the necessary repairs and replacement of the service heater and turn on the Pentair pool heater.

However, if you do not have the expertise with service heaters and cannot repair it, we recommend the help of a professional.

3. Water Flow Problem

Troubles with the water flow also cause the R13 error on the pool heater to appear. This usually happens when the water is restricted inside the exchanger chamber or the water pipes are clogged. Not only that, but an irregular flow of water also contributes to the issue.

How To Fix It:

Examine the heater to make sure that the flow of water is not restricted in any way and clear the chamber of all the accumulated water. Turn off the water valve and check the water pipes to ensure that there is no obstruction.

Clean the water pipes properly and remove all the dirt, dust, and other impurities that have accumulated over time.

Turn on the water valve and make sure that it is set to the right water pressure. Make sure that the water is flowing properly and without any trouble.

4. Temperature Settings

The Pentair error code R13 is often displayed due to an issue with the temperature settings.

Sometimes, the temperature of the pool water is higher than the temperature set on the heater, which prevents the heater from working. The R13 error on the pool heater appears as the heater doesn’t work.

How To Fix It:

Check the temperature of the pool water and make sure that it is lower than that set on the heater. Turn off the heater for a few minutes and restart it. Adjust the temperature and make sure that it is at least 2 degrees higher than the pool water temperature.

5. Improper Gas Flow

Last but not least, an improper gas flow also causes the Pentair pool heater to display an R13 error code. This usually happens when the gas flow is disrupted and the gas pipes are blocked. In addition to that, trouble with gas pressure also plays a major role in the issue.

How To Fix It:

Examine the gas chamber of the Pentair pool heater and ensure that the gas flow isn’t obstructed in any way. Turn off the heater and the gas valve properly and clean the gas pipes.

Ensure a regular cleaning schedule to clean the pipes to prevent the accumulation of dirt, debris, and so on. Turn on the heater and gas valve and make sure that it is set to the required pressure setting.


How To Clean The Clogged Pipes In Pentair Pool Heater?

Steam cleaners and handheld hoses work perfectly while cleaning the clogged pool heater pipes. You can also use tube brushes to clear the dirt, debris, and so on.

How Often Should I Clean My Pentair Pool Heater?

The Pentair pool heater must be properly cleaned at least once or twice a year. However, make sure to clean the pipes as frequently as you can to prevent impurities.

Can I Clean The Pool Heater On My Own?

Yes, you can clean the pool heater easily on your own. Maintain and clean the pool heater on a regular basis to ensure better longevity.

Is It Necessary To Fix The Pentair Heater Error Codes?

Fixing or solving the Pentair heater error codes is absolutely necessary. The pool heater won’t work properly if the heater displays an error code.


We are now at the end of the guide and you know all the possible reasons that cause the Pentair heater error code R13 along with their solutions. You can easily solve the error code whenever it appears with a little help from this guide.

Make sure to leave a comment below if you have any questions or queries about the Pentair pool heater. We will get back to you with the best possible answer soon.

About William

William is the founder of He has real life practical skills in fixing smoker & heating appliance issues. He loves to share his knowledge & helps others in fixing their appliances & saving their money. William firmly believes that anyone can repair his or her unit with the correct guidance & knowledge. See more at about us.

1 thought on “Pentair Heater Error Code R13 [Reasons + Solutions]”

  1. it appears I need an inducer /induction motor on my pentair mastertemp 125 as it won’t even do anything except make the motor really hot ! I don’t seem to be able to find this in the replacement parts available. can i get one or not ? I have r13 code displayed.


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