Common Navien Tankless Water Heater Problems And Solution

Navien tankless water heater is one of the latest products from Navien. This high-tech water heater is a reasonable choice to reduce electricity bills – many users reported.

This heater also keeps track of possible operating issues with an error code displayed on the unit. Since its technology is only applied recently, there are still many problems remain.

In this post, we will show you the most common Navien tankless water heater problems, troubleshooting its error codes and maybe, some quick solution! Without further ado, let’s go!

Common Problems

#1. No water coming out although the tap was opened

This is not usually what happened, but if there is no water coming out, then you should go check your pipe valves and water inlet filter.

The power valves could be shut off earlier. Besides, the filter could also be clogged by dust or unusual stuff from the water supply.

#2. Water stays cold

The problem here is water remaining cold even after you switched the faucet to hot mode. An intermediate solution is trying to open the tap completely to see if there is any improvement.

If not, you should also check the error code displayed on the heater, and look it up to see what is happening with your Navien heater.

#3. Water is not hot enough

In case water took forever to warm up, you could see if you accidentally set the heater at low temperature or not.

One other possibility is that there is a problem with your recirculation mode. In this case, you’d better have a contractor come to check the heater for you!

#4. Water is too hot

Generally, this happens because users have set the temperature too high. Try lower temperatures; it also benefits your electricity bill!

#5. Other minor problems

For any other strange, unusual or potentially dangerous, you’d better shut water heater off, then call for help from the technical support.

Troubleshooting and Solution

The Navien tankless water heater comes with a remote to keep track of what is going on with your heater and display the error code. Each error code leads to different operating problems so that users can quickly fix the heater themselves.

Control Board Failure

#E046 issues

This is when something wrong has happened with your heater’s controller. You’d better call the professionals! These numbers show that there is misbehaviour with your limit control, and that is not what you should mess with!

Flow Sensor Issues

#E060 issues

If you have no ideas on how to clean the venturi or fix the flow sensor, you should call the technical support for help.

#E434, E438, and E439 issues

Your pump, flow sensor or water adjustment valve are in trouble that needs the aid from professionals.

Heat Exchanger Breakdown

#E012 issues

A flame loss in this E012 case requires you to clean the air intake filter. Look up in the manual guide for how to clean it. There could also be connectivity problems, so make sure that your cord is grounded properly.

#E016 and E030 issues

This code displays an overheated heat exchanger problem. This could affect your heater’s durability. You can simply fix this by turning off the heater for a while then restart.

#E047 issues

Call the tech guys because your exhaust thermostat is wrong somewhere.

#E109 and E110 issues

There are problems with your heater’s fan and air pressure system. The solution is the same as for issue E012 that you should clean the air intake filter.

#E407, E421, and E432 issues

These are short-circuited problems, which are the real serious ones that you should call for tech support.

Man-made problems

#E003 issues

This is an ignition failure. Check if you had opened the gas supply valve or not.

Important note

Remember to turn off the electricity or unplug the water heater before touching it. It runs with electricity, so you need to be careful all the time to avoid terrible electric shock.

Final Words

Have you figured out what your error code is and how to fix it yet?

Well, if you haven’t, then your error code might not be here (since we do not list out all the possible code) and you should call for tech support. Navien tankless water heater problems are sometimes hard to comprehend, not to mention fix the heater on your own.

If you have any problems with your Navien heater, feel free to ask in the comment section! See in later posts!