How to Fix Navien Water Heater Error Code 110

If you have a Navien tankless water heater, you may encounter error code 110 on the front panel display. This error code indicates that there is an abnormality in the air pressure of the unit. This may affect the performance and safety of the water heater and prevent it from delivering hot water.

In this blog post, we will explain what causes error code 110 and how to fix it in simple steps.

What Causes Error Code 110?

Error code 110 is usually caused by one of the following reasons:

• The exhaust pipe is clogged or obstructed by dirt, debris, ice or snow. This prevents the unburned gas fumes from venting out of the unit properly.
• The air intake filter is dirty or restricted by dust, lint or grass. This prevents the unit from drawing enough air for combustion.
• The venting system is improperly installed or does not meet the specifications of the unit. This creates a back pressure or a negative pressure in the unit.

How to Fix Error Code 110?

To fix error code 110, you need to check and clean the exhaust pipe and the air intake filter and make sure that the venting system is correct. Here are the steps to follow:

To ensure that your gas-powered unit is operating safely and efficiently, there are several steps you should take. First, turn off the power and gas supply to the unit.

Next, inspect the exhaust pipe for any blockages or obstructions. If you see any dirt, debris, ice, or snow, carefully remove them with a brush or vacuum cleaner. If you see any cracks or holes, replace the pipe with a new one.

Then, inspect the air intake filter for any dirt or restrictions. To access the filter, remove the front cover of the unit and locate the filter on the upper left corner of the main PCB board. To remove the filter, unscrew the nut that holds it in place and slide it out of the plastic assembly. Clean the filter by washing it under running water with a soft brush and let it dry completely. To reinstall the filter, insert it back into the plastic assembly and secure it with the nut.

After that, inspect the venting system for any improper installation or deviation from the specifications of the unit. Refer to the installation manual for the correct venting requirements and make sure that there are no leaks, bends, sags, or dips in the venting pipes. Also, ensure that there are no other appliances sharing the same venting system with the unit.

Once you’ve completed these steps, turn on the power and gas supply to the unit and reset it by pressing and holding the reset button on the front panel for 2 seconds.

Finally, check if error code 110 is cleared from the display. If not, contact a qualified service technician for further assistance. By following these steps, you can ensure that your gas-powered unit is operating safely and efficiently.

Conclusion

Error code 110 is a common problem that can affect your Navien tankless water heater. It means that there is an abnormality in the air pressure of the unit. It can be caused by a clogged exhaust pipe, a dirty air intake filter or an improper venting system. To fix it, you need to check and clean the exhaust pipe and the air intake filter and make sure that the venting system is correct. You also need to reset the unit and clear the error code from the display.