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Thread: Navien NCB-240 BLEW!!!

  1. #1
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    Jan 2017
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    Navien NCB-240 BLEW!!!

    Came home to my Navien blr blowing city pressured water out of the cabinet. Shut water off and fnd that the water was coming from the cold domestic side inlet. Further investigation showed that a hole had been blown from a plastic cap located on top of the plastic inlet tee that connects to the flow sensor located in the boiler. Anyone ever seen this before or know what the cause was. Pretty unhappy that my first day with my newborn son was spent trying to get heat and hot water on in my hse. Also this issue ended up flooding my downstairs. Need some ammo before calling up Navien.

    Key info
    -blr under warranty still
    -blr Installed to manufactured specs
    -I get city water and it’s pretty clean up here in AK
    -did have pressure relieve on domestic side
    -water was static when blow (no one home when issue occurred)
    Last edited by BAMSTER04; 04-14-2019 at 04:32 PM. Reason: Added blr make

  2. #2
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    Thread Starter
    Do have photos if anyone knows how to upload them

  3. #3
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    Dec 2002
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    How many forum are you going to put this in? One should be sufficient.
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  4. #4
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    Thread Starter
    Enough to get an answer rather than a remark.

  5. #5
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    Aug 2002
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    Quote Originally Posted by BAMSTER04 View Post
    Enough to get an answer rather than a remark.
    Let us know how it goes with the factory!

  6. #6
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    Thread Starter
    Going to try and get ahold of the northwest rep first then go to the factory. Just wanted to see if anyone’s ever had this oddball issue with Navien or any other boilers using plastic fittings

  7. #7
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    Mar 2010
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    Rochester, NY
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    Have you done any work to it lately?
    I had that happen after changing a flow sensor because a clip didn’t seat right.

  8. #8
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    Jan 2017
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    Thread Starter
    Replaced the 3-way diverting valve 5 months ago but no have not messed with the flow sensor or it’s assembly. It looks like a bullet hole went through that cap.

  9. #9
    Join Date
    May 2019
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    Ive seen new ncb units shipped with some of the clips not fully in place, causing leaks on start up. I think most commonly was the condensate trap pin under the unit. Ive never specifically seen your issue though! Have you tried talking to Navien Tech? Warranty department is usually really good to deal with.

  10. #10
    Join Date
    May 2019
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    Below is my personal experience and there might be technicians out there which have a better ride with their products.

    I put in more then 20 units from the first right up to their third generation and was not seeing happy customers. Almost all flow sensors needed to be replaced over time. Those with a hot water recirculating loop got hit especially hard. Saw the plastic elbow failing on several units causing severe water damage in some cases.

    The manufacturer was always forthcoming in providing free replacement parts under warranty (sometime they tried to blame water quality and other factors, BS) but customers were repeatatly out of hot water for days which is not acceptable. Once the part warranty expired my clients were exposed to expensive repair bills. On three occasions we had to change out the entire unit due to recurrent failures and leaks.

    We got away from Navien due the high failure rate and are very happy with Noritz and Rinnai which are working flawlessly when properly maintained.

  11. Likes Metalman0880 liked this post.
  12. #11
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    Aug 2003
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    I have repaired or replaced my share of these the last one was for a leak from a pvc elbow i called tech support and two days later the ups showes up with a big bos and in it was a entire repair kit.navien is the least expensive unit out there so i tell the customer you get what you pay for

  13. #12
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    May 2019
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    Quote Originally Posted by splus View Post
    I have repaired or replaced my share of these the last one was for a leak from a pvc elbow i called tech support and two days later the ups showes up with a big bos and in it was a entire repair kit.navien is the least expensive unit out there so i tell the customer you get what you pay for
    At the end of the day its is us technicians which make a recommendation for our clients to choose one unit over another. Most of the time there are only neglect able nuances why we prefer a certain unit but in case of Navien products we decided to stay clear of their line due to their high failure rate we experienced.

    I don't think we are doing the customer a favour to safe some bucks when down the road they have to go through all that grief. It also doesn't shed a representative light on the entire tank less technology which is successfully and widely used in the rest of the world.

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