What does error code 438 mean?

E438 is caused by the circulation system not working correctly. I have ran into this error code after i had a check valve go bad, it wasn’t allowing full flow thru the circulation system. Second issue that could cause this is the flow control sensor. it is a small fan like sensor that moves when water passes.

How do you reset a Navien tankless water heater after a power outage?

To turn the water heater on or off, press the Power button. When the power is on, the temperature will appear on the front panel display. If an error message appears, you can try resetting the water heater to resolve the problem. To reset the waterheater, press the Reset button.

Why does my navien NPE keep saying e438?

Customerreply replied 2 years ago I checked all that and the circulators are working as I checked them it has water flowing through the system. If I open the cold water drain or hot water drain it will stay running. Could it be the flow sensor? Plumber: WCohn, Journeyman Plumber replied 2 years ago

What to do if your navien water heater has an error code?

Some problems can be solved with simply resetting the water heater unit (press the Reset button on the front panel) but other require more work. Below you’ll find the most common error codes for a Navien tankless water heater along with a suggested fix.

Why do I get an error code e438?

I’m getting an error code E438. I have an external circulation system. I put the system into the – Answered by a verified Plumber We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policyunless you have disabled them.

What causes a navien tankless water heater to shut down?

Inspect and clean the filter in cold water inlet. Flush the heat exchanger. What it Means: Exhaust overheating. The unit will shut down when the temperature in the flue exceeds 149° Fahrenheit (65° Celcius). How to Fix: Turn off the water heater for 30 minutes and restart. Inspect and clean the filter in cold water inlet. Flush the heat exchanger.

Where can I get a navien error code?

Get a free estimate online from top local home service pros in your area. There are a large number of unique Navien error codes that help with troubleshooting the issue. Some problems can be solved with simply resetting the water heater unit (press the Reset button on the front panel) but other require more work.

Customerreply replied 2 years ago I checked all that and the circulators are working as I checked them it has water flowing through the system. If I open the cold water drain or hot water drain it will stay running. Could it be the flow sensor? Plumber: WCohn, Journeyman Plumber replied 2 years ago

Is there an error code on my navien tankless water heater?

Like any other water heater, sometimes you may experience a problem with your Navien tankless water heater. When an issue arises, your Navien will likely display an error code on the LCD display on the front of the unit.

What should I do if my navien boiler is not working?

One of the competitive advantages of Navien is its troubleshooting system. Below is a table of Navien boiler error codes. Ensure that the main gas supply valve is open. Ensure that the electrical cord is properly grounded. • Clean the intake air filter. • Ensure that the electrical cord is properly grounded. • Clean the Heating Return filter.