Noritz NR71: What does the flashing code mean?

Discussion in 'Tankless Water Heater Forum' started by mptrauber, Apr 9, 2012.

  1. mptrauber

    mptrauber New Member

    Apr 11, 2009

    I'm needing some advice on my tankless. It's been running beautifully for about 16 months but in the past couple of days has stopped heating a few minutes into use.

    The front error lamp just flashes repeatedly with no pattern. If I recycle the power on it, it'll start up and give me hot water again but then shut down as before.

    I didn't get one of the fancy remote control things so don't have a code to go by.

    Any troubleshooting advice?

    Thanks very much.
  2. Hackney plumbing

    Hackney plumbing Homeowner

    Jan 6, 2010
    Call a plumber who can connect a remote to get the codes. Your about to spend some money.
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    Where do you live? IF you have hard water, you might need to descale the insides of the tankless system. This may be secondary to whatever problem there is currently, though. Depending on your water quality and use, the things can require descaling on a yearly basis. This can significantly impact any savings you might get on heating the water, and is one reason why you have to research the things prior to installation to determine your long-term costs and benefits. Sometimes it works out, sometimes it doesn't.

    When there isn't an actual display, sometimes they'll flash the error light in a sequence, like 2 short, one long flash. Read your owner's manual, it might let you decode the error without the remote. If so, that should help point you towards the problem. If it's just nice even flashes with no pauses or uneven on times, then this may not help you at all, but first, look for a sequence, then the manual.
  5. mptrauber

    mptrauber New Member

    Apr 11, 2009
    Yes. It's just flashing with no pattern. It apparently means "something's wrong" with no more detail than that. The Noritz folks also suggested descaling, so I'll do that first.

    Thanks again for the help.
  6. mptrauber

    mptrauber New Member

    Apr 11, 2009
    Okay. I know it's been some time, but thought I'd post a follow-up since clearing things up.

    Bird's nest in the exhaust. Apparently an anti-bird thimble was left off. And for you nature lovers-and who among us isn't?- we carefully removed the nest and placed it nearby in a tree as the building bird watched.
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