Navien tankless water heater E351 error code FIX Navien tankless water heater problems maintenance
TheMillennialHomeowner TheMillennialHomeowner
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 Published On Jan 9, 2019

⚠️PERFORM THIS AT YOUR OWN RISK!⚠️

I am not a licensed plumber or HVAC technician. I am only showing what I did to correct my issue on my unit.

Link to water pressure sensor:

https://amzn.to/3m5Ozuj


FULL DISCLAIMER: I am not a plumber or HVAC tech. What you see me do is done at my own risk and if you perform what you see in the video on your own unit you may cause damage at your own risk. Filling the pressure too high can cause bursting of pipes. Check with the manufacturer for recommendations on water pressure.

My specific unit is a Navien tankless water heater/furnace model NCB-240e. Error code 351 was flashing on the LCD screen with a red wrench symbol as well. This is what I did to “correct” the issue.

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