Navien Tankless E.012 Error. Heat Rod Replacement 

Flame loss or issues with heat rod and sensor are one reason you get a E.012 error in your Navien 240 Tankless Hot Water Heater. In this video I show how you can replace the Ignitor and Flame Rod assembly yourself. Make sure you unplug the unit and make sure it is cool (not been running in last 30 mins).