How to Fix Navien Tankless Water Heater Error 110-01
ANavien and other tankless water heaters are known for being reliable and efficient, but they can still have problems. Navien tankless water heater external vent blockage error 110-01 is one of the most common problems people have with their water heaters. If you see this code on your unit, don’t worry—it can usually be fixed by troubleshooting.
You will learn what error 110-01 means, why it happens, and how to safely fix it in this guide.
What is Navien Error Code 110-01?
If you get the error 110-01 on a Navien tankless water heater, it means that the outdoor exhaust is blocked. This means that the combustion gases are not getting out of the venting device as they should. The water heater turns off to protect you from carbon monoxide risks when airflow is blocked.
Causes of Navien Tankless Water Heater External Exhaust Blockage Error 110-01
There are a few things that can cause the error:
- Vent Pipes Blocked
- There may be ice, bird nests, or other things stuck inside the vent.
- Installing a vent incorrectly
- Not enough space or the wrong slope.
- Clogged Air Intake
- Dust, dirt, or foreign objects restricting airflow.
- Faulty Exhaust Fan
- The blower motor may fail or slow down.
- Moisture Issues
- Condensation freezing in cold climates.
- Oversized Vent Length
- Longer vents than recommended by Navien specs.
How to Fix Error 110-01
Turn Off the Heater
- Before you look at it, turn it off and unplug the power.
Inspect the Exhaust and Intake Pipes
- Look for ice snow or nests on the outside vent connections.
- If it’s frozen use a brush or warm water to remove anything that is in the way.
- Make sure the vent pipes are far enough away from walls or other items (12 inches is the norm).
Clean the Air Intake Filter
- The filter can be found on the water heaters side.
- To get rid of dust and other things, take it off and rinse it with warm water.
- Before putting it back let it dry all the way through.
Check for Proper Venting Installation
- Make sure the length and angle of the vents follow Navien’s instructions.
- Cut vents that are too long or rearrange pipes that were put wrong.
Inspect the Exhaust Fan
- Pay attention for strange sounds coming from the fan.
- If the fan is weak or not spinning it may need replacement.
Reset the Water Heater
- After clearing obstructions and cleaning filters restore power.
- There is an error code. To clear it, press the reset button.
Preventing Future Error 110-01 Occurrences
- Make an appointment with a qualified technician for yearly maintenance.
- Put up air screens to keep bugs and birds out.
- In cold places insulate vent lines to keep them from freezing.
- Clear away any snow and other things that might be in the way of the vent connections.
- To keep your unit running smoothly, clean it regularly (see Tankless Water Heater clean).
Related Maintenance Resources
- How to Flush a Water Heater – Prevents sediment buildup.
- Gas Water Heater Repair – If dealing with gas-related issues.
- Heat Pump Water Heater vs Tankless – Helps you evaluate different systems.
Cost of Fixing Navien Error 110-01
- DIY cleaning: $0–$50 (basic tools).
- Professional service: $150–$400 depending on venting or part replacement.
- Blower motor replacement: $200–$500.
When you think about how much it costs to put a new water heater, fixing error 110-01 is often the better option.
Conclusion
The navien tankless water heater external exhaust blockage error 110-01 may seem intimidating but in most cases it comes down to blocked vents dirty filters or minor installation issues. You can make sure your Navien unit keeps working well and safely for years by following the steps above for fixing and setting up regular maintenance.
Would you also like me to make a troubleshooting checklist table with (symptom, cause, answer) so that people can quickly look through fixes for error 110-01?
Question That People Ask A Lot
1. What does error code 110-01 mean on a Navien tankless water heater?
It shows a Navien tankless water heater external exhaust blockage error 110-01 which means that the system can’t properly release gases because it’s blocked or broken.
2. Can I fix error 110-01 myself?
Yes, in many cases. You can clean the air intake filter and clear snow, dirt, or nests out of the vent lines. If you are having problems with your fan or the installation, you should call an expert.
3. How do I prevent exhaust blockage errors in the future?
- Clear snow regularly in winter.
- Install pest screens.
- Schedule annual professional maintenance.
4. Is error 110-01 nothing to worry about?
Yes, Ignoring the error can lead to carbon monoxide buildup, which is hazardous. Always address it promptly.
5. Does this error mean I need a new water heater?
Not necessarily. Most of the time, cleaning vents or replacing a fan resolves it. Replacement is only needed if the system is old or repeatedly failing.