What does Rinnai Tankless Water Heater Error Code 11 mean?

An error code 11 often points to a problem with the fuel going into your Rinnai water heater. Gas may not be reaching your unit or pressure may be too low. An issue with your ignitor or flame rod might also be the issue.

There are a few things you can check yourself to see if there’s a simple answer to your lack of hot water. If these options don’t work, it’s time to call a professional Rinnai tankless water heater expert at Full Stack Plumbing.

Contact us today to schedule an appointment with a Triangle plumber in Durham, Raleigh, Cary, Chapel Hill, Carrboro, Pittsboro, and beyond.

What Do I Do if Error Code 11 Shows Up on My Rinnai Water Heater?

An error code showing up on your Rinnai Tankless Water Heater can cut off your hot water in an instant. Besides frustrating everyone in the family, an error warning may be pointing to a serious problem.

When a Rinnai unit flashes an error code 11, it may be indicating one of several types of issues. There’s usually either a problem with the gas supply (propane or natural gas) or with the ignition of that gas.

There are a few things you can check yourself, but you should have some experience in plumbing before taking on more complex problems.

You can poke around and end up voiding the manufacturer warranty on your Rinnai water heater. You could endanger yourself and your family when working around these combustible fuels. Always call a professional plumber when you are unsure of what to do.

Here are some of the most common Rinnai tankless water heater problems that lead to an error code 11:

  • No Gas – You can check your gas valve going into your tankless water heater to make sure it’s turned to allow gas to flow. In a newly installed gas water heater, the lines can also have air in them and they would need to be cleared.
  • Incorrect Gas Pressure – If the gas lines don’t deliver enough pressure, your water heater will warn you with an Error Code 11. Your lines may be obstructed and not be letting enough gas through. A problem could exist in the main line outside your home.
  • Ignitor Issue – It’s important to confirm that the ignitor is providing a spark. Carbon build-up can leave an ignitor unable to ignite the gas that is entering. Your ignitor would need to be cleaned.
  • Flame Rod Issue – The wiring leading to the flame rod could be damaged. Dirt on a flame rod or the gasket would have to be cleaned before the water heater would work properly again.

These and other inspections are usually better left to the professionals. The skilled plumbers at Full Stack Plumbing would also check other potential issues. The ventilation for your Rinnai tankless gas water heater could be blocked and causing the error code. Drainage for the unit’s moisture might also be obstructed.

Our experts like to start with the simplest fixes first We never want to provide you with repairs and part replacements that you really don’t need.

Expert Rinnai Tankless Water Heater Repair at Full Stack Plumbing

Our expert plumbers are happy to come to the rescue when your family is suddenly deprived of hot water.  We can tell you what error code 11 and other error codes mean and get to work finding the exact problem.

We are locally owned, and our staff is fully licensed and certified. Full Stack Plumbing offers affordable prices. We also practice transparent pricing. This means you’ll know what you’re paying for and what services you’ll get for your money.

Contact Full Stack Plumbing for Rinnai Water Heater Repair

If your Rinnai tankless water heater suddenly stops working and flashes an error code, don’t hesitate to call the experts at Full Stack Plumbing.

Our team of licensed, trained, and fully insured Raleigh plumbers handle Rinnai water heater repairs and installations in the triangle area, including Chapel Hill, Carrboro, Pittsboro, Cary, and Durham.

Don’t suffer through any more cold showers! Contact us today to schedule an appointment.

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These are our core values, and this is how we build relationships built on trust. We are not a traditional plumbing company, we are associate owned which means that we will always provide you with exceptional service, innovative practices & fair pricing. As water flows, it can cause systems to break down or backup, that’s why Full Stack Plumbing is always on call for all of your plumbing needs in Pittsboro. Simply stated, Full Stack Plumbing will always keep you in the flow.

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When you reach out to us via phone or online through platforms like Yelp, Facebook, or our website, our friendly customer service team will promptly gather your details and help you book a convenient appointment. Choose from our morning or afternoon service windows, and receive immediate confirmation through text.

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On the day of your service, you’ll get a text with your technician’s name and photo, letting you know they are on their way and will arrive within 30 minutes. Our expert technicians will assess the issue and provide you with transparent estimates for different options (good, better, best) without any obligation. If you decide to proceed, we aim to complete most repairs or installations the same day.

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See What Clients Say About Us

Don’t just take our word for it! Read on to see what our satisfied customers have to say about their experiences with us. From our honest pricing to our exceptional service, discover why residents choose us as their trusted local plumber time and time again.
Elizabeth Marshall
Elizabeth Marshall
00:04 17 Jan 25
Corey was very professional, courteous and patient with my elderly father who had a plumbing issue. Corey explained exactly what he would be doing to fix the issue. Corey and Full Stack were also ethical. An out of town company quoted a repair that was not needed and quoted an extremely expensive repair price. Corey and Full Stack saved my dad money and were able to fix the issue quickly. I will definitely be using Full Stack for any plumbing needs I may have.
Bob Hannau
Bob Hannau
22:47 16 Jan 25
Peyton and crew did a great job!!!
Robert Kim
Robert Kim
23:26 14 Jan 25
The plumbers came when they promised, gave me a fair price for the work, and finished the job quickly! They were very professional! Full Stack always treats us right!!!
Jason Martin
Jason Martin
17:19 09 Jan 25
Very satisfied with Bryan with Full Stack Plumbing. Professional, polite and got the job done. I enjoyed meeting Bryan and his co-worker. Definitely will be calling Full Stack for future plumbing needs
B CM
B CM
13:28 08 Jan 25
These guys are always the best
Justin Brewer
Justin Brewer
16:00 07 Jan 25
I have used Full Stack twice now, and both times they have been very professional and helpful. I had a busy schedule on the day of my service with kid drop-offs and school delays, but they worked around my timeline and serviced my tankless hot water heater. JJ was especially helpful and communicated what was being done clearly and professionally. I have recommended them to my neighbors because they do an excellent job.
Emily O'Barr
Emily O'Barr
23:58 19 Dec 24
My experience was exceptional!!!! Jeff and his helper were amazing & I’m very grateful I found you guys!!
Joseph Heil
Joseph Heil
18:59 18 Dec 24
Excellent service. Curry and his crew did great work, communicated well, and left the job site spotless. I highly recommend Full Stack.
Richard Thorne
Richard Thorne
19:02 04 Dec 24
Once again Full Stack hits a home run! Pretty bad leak at the outdoor hose bib. Have me a price, seemed simple to fix. Then they found it more difficult as it was installed incorrectly from previous plumbers, they got right to it, fixed it in a very timely fashion, took pics to show me everything and charged me original price. Oh, the young fellas they have working are great! Really an outstanding experience again. They are my new plumbers and I’m spreading it far and wide. Full Stack Rocks! Rich T
Alan Eisenberg
Alan Eisenberg
17:12 11 Nov 24
Your representatives were very professional and great to work with. They did an excellent job.
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