Tankless Water Heater Error Codes Jacksonville, NC | Troubleshooting Guide
Tankless water heaters are great—until one stops working and flashes a weird error code you’ve never seen before.
I get a lot of calls from Jacksonville homeowners asking, “What does this code mean?” or “Do I need to replace the whole unit?”
The good news is, most of the time, the fix is easier than you think.
I’m Justin Wilder, a Navy Veteran and the owner of Wild Water Plumbing.
If you’re staring at an error message on your tankless water heater, here’s what you need to know—and when it’s time to give us a call.
What Are Tankless Water Heater Error Codes?
Most modern tankless systems—Rinnai, Navien, Noritz, and others—use built-in error codes to help you and your plumber figure out what’s wrong.
These codes are super helpful once you know what they mean.
They’re like your water heater’s way of saying, “Hey, I’ve got a problem, and here’s where to look.”
Common Tankless Water Heater Error Codes We See in Jacksonville
Here are a few of the most common error codes we run into on service calls:
🔧 Error Code 10 – Air Supply or Exhaust Blocked
This usually means something is blocking the vent or air intake.
It could be leaves, dirt, or even a bird’s nest. If your unit is in a tight spot outside, check that nothing’s covering it.
If it’s clear, we’ll inspect the venting system and fix it safely.
💨 Error Code 11 – Ignition Failure
If your heater won’t light, this code will pop up.
It might be a gas supply issue or a dirty ignition plug.
Don’t try to fix this yourself—it’s best to call a licensed plumber to handle anything gas-related.
💧 Error Code 16 – Overheating
Your water heater’s getting too hot.
This can happen if there’s scale buildup or a flow restriction.
If ignored, it could lead to a full system shutdown.
We’ll flush the system and make sure it’s safe and running smoothly again.
🔄 Error Code 61 – Fan Motor Issue
The fan motor helps push air through your unit. If it fails, your system won’t run.
Sometimes, it’s just debris or wear and tear.
We can test and replace the part if needed.
⚠️ Error Code 90 – Combustion Issue
This one’s serious. It means the unit isn’t burning fuel properly.
It could be a venting issue, a dirty burner, or a failing sensor.
If you see this code, shut the unit off and call us right away.
When Should You Call a Plumber?
Some homeowners try to reset the unit and hope the problem goes away.
Sometimes that works—but if the same code keeps popping up, it means the system needs real attention.
Don’t wait too long. Ignoring error codes can lead to bigger damage and higher repair costs.
At Wild Water Plumbing, we know these systems inside and out.
Whether you’ve got a Rinnai, Navien, or another brand, we’ll diagnose the issue fast, explain what’s going on in plain English, and get it fixed right the first time.
Call Your Local Tankless Water Heater Expert
You don’t have to guess what that flashing code means—we’ve got your back.
As a veteran-owned plumbing company in Jacksonville, NC, we take pride in providing honest service, fast responses, and ensuring your hot water stays hot.
📞 Call Wild Water Plumbing at 910-750-2312
🛠️ Tankless repair done right—with zero guesswork.