How To fix Rheem Tankless Water Heater Code 29?

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Last Updated on July 22, 2023

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Rheem Tankless Water Heater Code 29

There is a range of companies in the market that are now in the race to manufacture tankless water heaters.

All of these are really advanced and have minimal differences in their functioning. You can find these heaters in Rinnai, Bosch, and Rheem.

If you are using the Rheem heater and facing issues with the error code on the same, we will discuss that here.

In this article, we are discussing the Rheem Tankless Water Heater Code 29.

If this error code shows up on your water heater, it means that the heat exchanger outlet on the water heater is experiencing problems with a low temperature.

Let’s discuss the various reasons that could contribute to this issue and how you can get rid of the error code 29 on the heater.

Fixes For error 29 on Rheem Tankless water heater

When the technology becomes more advanced, new features are included on the devices to make the new development work.

However, sometimes these new additions on the device start malfunctioning and cause issues. For error code 29, we are looking at the issues that are present on the heat exchanger outlet of the heater.

Let’s take a look at the helpful fixes to eliminate the error code and make sure that the heat exchanger outlet works fine at the end.

Fix 1: The Outlet temperature is too low

The heat exchanger outlet on the Rheem tankless water heater should be in a range of temperatures specified for the machine.

If the temperature is too low, you will receive a warning on the heater in the form of error code 29.

This could be because of buildups blocking the outlet. When water runs through the machinery for a long time, some corrosion is possible and these small buildups can clog the outlet over time. Make sure that you check the outlet valve for any buildups and clean it regularly so that this problem does not show up in the future.

Fix 2: Check the resistance readings for the heat exchanger

Check if the temperature is still being displayed when you take a look at the maintenance information of the heater.

If the temperature is not visible, the resistance readings of the heat exchanger need to be verified. 

If the readings do not match the specified amount, you will need to replace the heat exchanger. 

Fix 3: The neutralizer is clogged

There are different models of the Rheem tankless water heater sold in the market. Error code 29 could mean different things for each one of them.

On some models, the error code 29 means that the neutralizer for the water heater is not working well. 

This could be because the neutralizer pipe is blocked. Whenever you are operating machinery that has a continuous flow of water, blockages are a very common possibility. You need to check for any blockages on the water heater neutralizer and clean the pipe if necessary. 

Fix 4: Check the drain pipe

The drain pipe is another component that needs to be examined for a blockage. It is the most common component of the heater that is prone to buildup.

Check the drain pipe for any debris and clean up if you find any debris. To avoid problems with the blockages on the heater, make sure that you regularly clean up the appliance.

Fix 5: Check for frozen water in the drain pipe

If you live in an area where you receive heavy snowfall and harsh winters, you might need to check the location of the drain pipe.

The drain pipe if exposed to cold temperatures can get frozen water stuck as a blockage and will not allow anything to pass through the frozen wall of water.

Make sure that you prepare ahead for the winter months and place the appliance in a place where the drain pipe does not freeze.

Fix 6: Contact a plumber

Other aspects of the error code 29 on the Rheem tankless water heater can be a little more technical and you will need help from an experienced plumber to help with the appliance.

You can also contact the heater company and ask them to send someone on their end. This works great in situations where you have a warranty on the appliance that you can use for free repairs and a replacement if needed.

To conclude

Error code 29 on the Rheem tankless water heater is mostly an issue with the draining mechanism of the heater.

We have suggested some solutions for the issue but in any case, if you are not sure about doing this on your own, take a step back and call in an experienced individual who will help you with the issues without risking further damage to the appliance. 

We hope that this was a helpful resource for eliminating error code 29 on the Rheem tankless water heater.

Keep following for more technical advice.

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Falguni Rana is a technology writer who has expertise in software and hardware troubleshooting. He publishes how-to and troubleshooting guides for different apps, websites, games, and consumer hardware products.