Question about Noritz 6.9 Gallon Residential Direct Vent Tankless Water Heater - N

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Leaking Noritz water heater.... I have a Noritz N-069m water heater. When i purchased the unit 3 years ago, i was told that if i installed a water softner unit it would void the warranty. A year and a half later the unit failed and caused major water damage of which i covered the repair costs. Now one year after the repair the unit has done the same thing and the damage is more sever. The problem seems to be a heater exchange reservoir. I have now been instructed to install a water softner system, the problem is.... the construction is done and the budget is gone. It seems i am in a real dilemma.

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Check your water pressure and the diagnostic codes on the controller to see if there is computer failure or another problem with the unit. send me an e mail i might be able to help im a nortiz certified service tech scott@bridgeplumbing.net

Posted on Jul 28, 2009

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Posted on Jan 02, 2017

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EC 71 usually means you are using a battery backup that doesn't produce a pure sine wave. OR you recently had a power outage and it shorted the circuit board. if you have a battery backup try unplugging that and see if it works okay. If not, just call Noritz for a replacement c/b.

Dec 06, 2013 | Noritz 6.9 Gallon Residential Tankless...

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I have a Model N-069M and i get a flashing code 16. I just had the unit flushed two days ago and i still get the same code. thanks for any help


I feel your pain. I am experiencing the same issue which started about 3 weeks ago. First it happened twice that first week and we discounted it. Now that my heater has been flushed the same issue is occuring. I called Noritz 3-4 times now and they are saying that I may have high manollowifold pressure and should have that checked.

FollowUp: Plumber determined my Natural Gas inlet line was too small. He Tee'd off before my manifold to other appliances and fed with a 3/4 line. Issue resolved and it has been trouble free since. (Updated 2/2017)

Feb 12, 2011 | Noritz 6.9 Gallon Residential Tankless...

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I have a Noritz Tankless outside my home on wall for several years. Works fantastic until now. Controller is going blank intermittently. Able to restart after resetting GFCI, plugging and replugging. On...


It sounds like your GFI is tripping. There are two common reasons for this to happen 1) plugged into another GFI 2) moisture on the gfi. I'd look for evidence of a water leak which is tripping your gfi. Look for puddles, water spotting, water hardness, etc.

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