Rinnai Error Code 58

Beginner Info

Rinnai Error Code 58
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In this post, I’ll be walking you through various aspects of Rinnai Error Code 58 in order to help you make an informed decision.

Moreover, I’ll also be throwing light on the troubleshooting steps that are easy to expedite and can be done in an epigrammatic span of time.

In fact, irrespective of whether you’re a first-time buyer or a seasoned professional, you can expedite these steps on your own and the best part is that you don’t need a certified technician for guidance, interesting, isn’t it?

So, without any further ado, let’s begin…

Rinnai Error Code 58

The Rinnai Error Code 58 is associated with a secondary heat exchanger sensor and is displayed when one of the two bi-metals opens.

At the same time, you should also be aware of the fact that the tankless unit may or may not be operating during the time of displaying Rinnai Error Code 58.

The error will stop displaying only when you’ve fixed it.

In general, error code 58 is related to issues related to wiring between the sensor and the PC board.

The good news is, you can fix this error code on your own without the need of having in-depth knowledge of plumbing.

As soon as the error code 58 starts displaying, the first thing that you need to do is to flush your secondary heat exchanger in order to prevent scale buildup.

If needed, shut down the secondary heat exchanger so that further damage can be prevented.

Moreover, if you live in an area of hard water then you must use a water softener in order to protect your tankless water heater from damage.

Flushing a tankless water heater is easy.

You can either use a flush kit or even vinegar can do the trick.

Once you’re done with the flushing, the next thing that you need to do is to perform a hard reset by turning the power off and back on.

The probability is very high that the Rinnai error code 58 will disappear.

However, if that isn’t the case, then you should contact the Rinnai service center or a certified technician.

Rinnai Error Code 58 Troubleshooting

  • Check the sensor wiring harness for loose, broken, or damaged connections from the sensor back to the PC board
  • This code indicates a scale build‐up inside the secondary heat exchanger and it needs to be flushed to prevent damage
  • Descale unit with a tankless flush

It’s A Wrap

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Cutting long-story-short, all the information provided in this post is enough to guide you in troubleshooting Rinnai Error Code 58.

We’ve been recommending these steps to our clientele for quite some time, and the feedback that we’ve received so far is positive and promising.

Nonetheless, if you still have any doubts or queries, then feel free to reach out to us via the contact form and our core team will be more than happy to assist you in the best possible way that they could.

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