Navien Error Code 515-09 Abnormal Pcb-How to fix?

In the world of tech household appliances, Navien stands out for its innovative and efficient heating products. However, like any advanced technology, it has its issues, one of which is the error code 515-09 indicating an abnormal PCB (printed circuit board). This error code can cause significant inconvenience to users. This in-depth article will provide…