In this video I'll be showing what parts you'll need to replace in your Navien tankless water heater to get rid of error codes E.012 and E.445.
This process is fairly simple, easy and fast. This fix requires very little tools and knowledge about plumbing. You'll need to purchase couple of parts on Amazon and that's it.

Part's you'll need for this repair:

Water Adjustment Valve (30008245A)
https://amzn.to/3GoQCAP

Flame Rod (30012226A / 30026265A)
https://amzn.to/3TaDGpA

LED head lamp
https://amzn.to/3uK3sHe

Thanks for watching this video and I hope you found it helpful.

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May God bless you.