E003 Navien Code. Click here to find a contractor in your area. To solve this error, try checking and cleaning the air filter and fan motor.
![Navien Npe 240A Error Code 003 360designsnyc](https://i2.wp.com/f01.justanswer.com/8XSNga49/D7BAF3BD-4984-4367-9D60-BCA2FACDC629.jpeg)
Your tankless unit will throw. We highly recommend calling a. It specializes in the production of gas, diesel boilers.