Navien NPE-240A NG Leaking

Discussion in 'Tankless Water Heater Forum' started by ilans1, May 21, 2017.

  1. Russell Esposito

    Russell Esposito New Member

    Joined:
    Oct 2, 2019
    Location:
    NY
    I have a Navien 240 combo unit for 3 years and have the same oily condensation now , exactly same as the pics on this forum. I read the last entry about the exhaust seal, but that doesn’t seem to be the root cause. Gas exhaust has no oily characteristics, and the oil is only on the black plastic as if the plastic is weeping. Shouldn't Navien want to analyze the chemistry samples of this oily substance that a few of us can send. Do we agree?
     
    Last edited: Oct 3, 2019
  2. Russell Esposito

    Russell Esposito New Member

    Joined:
    Oct 2, 2019
    Location:
    NY
    I have a Navien 240 combo unit for 3 years and have the same oily condensation now , exactly same as the pics on this forum.
     
  3. Russell Esposito

    Russell Esposito New Member

    Joined:
    Oct 2, 2019
    Location:
    NY
    I have a Navien 240 combo unit for 3 years and have the same oily condensation now , exactly same as the pics on this forum. I read the last entry about the exhaust seal, but that doesn’t seem to be the root cause. Gas exhaust has no oily characteristics, and the oil is only on the black plastic as if the plastic is weeping. Shouldn't Navien want to analyze the chemistry samples of this oily substance that a few of us can send. Do we agree?
     
  4. Navien Inc

    Navien Inc New Member

    Joined:
    Sep 3, 2019
    Location:
    20 Goodyear, Irvine, Ca
    For any concerns regarding your unit, please call 800-519-8794 option 2 and we will address it.
     
  5. Aristoc

    Aristoc New Member

    Joined:
    Oct 11, 2019
    Location:
    Ontario
    I have a Navien 210a water heater on gas. It is 5 years old , no problems. It has internal recirculation turned on . No external features.I would hear the recirculation pump and burner kick on in the mornings before my shower, about 20 minutes before but I dont really hear that anymore. so not 100% sure if that is working. there are no error codes.
    I have the same brown/greasy sticky stuff all over the black parts inside the cabinet! What on earth is this from? Why is it only on the black parts? I have a CO detector in the main floor and this unit is in the basement but no alarms.
    There is also some corrosion on some of the pipes. The little red cap also was a bit loose and there was clear water around it. Really weird things.
    i have maintanied this unit yearly with vinegar flushes. I ph0ned Navien and they just said to phone a service tech.

    I also looked into the condensate pump which pump the condensate fluid to the laundry drain. I tested it and it is working, but when i looked inside there is the clear condensate liquid, watery but also there is a collection of brownish residue floating around that looks about the same color as the greasy sticky stuff inside the tankless cabinet. So i am pretty sure there is condensate that is collecting on the plastic parts. How? I don't know.


    IMG_20191006_082615506.jpg IMG_20191006_081820069.jpg IMG_20191006_081847242.jpg IMG_20191006_082530525.jpg
     
    Last edited: Oct 12, 2019
  6. Navien Inc

    Navien Inc New Member

    Joined:
    Sep 3, 2019
    Location:
    20 Goodyear, Irvine, Ca
    We recommend that you call into our tech support at 1-800-519-8794 option 2 so that we can have our team diagnose the issue and provide a solution. Our tech support is available Mon-Fri from 8am - 9pm EST and Sat-Sun from 8am - 8pm EST. Thanks!
     
  7. Aristoc

    Aristoc New Member

    Joined:
    Oct 11, 2019
    Location:
    Ontario
    I got answer from the tech that it might be the venting exhaust is coming back into the unit. Makes sense to me. My tech will be repairing this shortly.
    Thank you!
     
  8. MAURICE A GERMAIN

    MAURICE A GERMAIN Maurice

    Joined:
    Oct 17, 2019
    Location:
    Regina
    I have a Navien NPE-240A heater with the same oil like condensation on the black cover/collector as per photos. I've had no alarms on the co2 detector. I am interested in what has caused this oils like liquid on this box. Is it exhaust venting?
     
  9. Aristoc

    Aristoc New Member

    Joined:
    Oct 11, 2019
    Location:
    Ontario
    Hi Maurice, could you post some pictures?
    I was told the exhaust is coming back into the cabinet. It could be from the exhaust that leaves the unit gets sucked back into the intake vent. Over time the droplets collect on the black plastic. Take a picture of your exhaust and intake vents too. If not installed properly it may be one of the reasons for the problem.
     
  10. bnymbill

    bnymbill New Member

    Joined:
    Feb 12, 2016
    Location:
    Baltimore, Maryland
    I am wondering if I have the same problem, the exhaust was piped with a 2” street hub instead of a 2” pipe. I have water on top of the unit from time to time but the inside appears to be dry. My guess is the exhaust does not have a great seal and condensation is escaping around the street hub going to the exhaust fitting. Does my theory make sense?
     

    Attached Files:

  11. Aristoc

    Aristoc New Member

    Joined:
    Oct 11, 2019
    Location:
    Ontario
    page 34 of the navien npe tankless water heater maunal shows you bnymbill that your exhaust pipe coming out should not be curved.
    https://www.navieninc.com/products/npe-210a/downloads

    i still have not solved my leaking brown oil on my unit from my earlier description. waiting for new exhaust vent fitting and exhaust ring to arrive and install.
     
  12. TEch99

    TEch99 New Member

    Joined:
    Oct 14, 2020
    Location:
    Jersey
    Its oil used during their milling process to fabricate these heat exchangers. The oil is possibly corrosive on the electrical components, or changing resistance on the board, so ensure to wipe the boards clean with an appropriate electrical board cleaners. Navien needs to come out and give a public announcement on the issue to avoid homeowners calling private techs to investigate thus costing them unnecessary expenses and leading them on a wild goose chase. THEY ARE WELL AWARE OF THIS ISSUE and frankly there is no need to call a tech and not sure why they're advising home owners such. You will not see this oil again after a good wipe down and you should pay close attention for any future electrical component failures.

     
    Last edited: Oct 15, 2020
  13. TEch99

    TEch99 New Member

    Joined:
    Oct 14, 2020
    Location:
    Jersey
    Although knowing this $10 Korean sensor fails often on these units, they failed over and over to assist customers. Turning a $40 job into $400 by requesting a plumber on a simple task that many Americans can take on.


     
  14. TEch99

    TEch99 New Member

    Joined:
    Oct 14, 2020
    Location:
    Jersey
    Why not just tell him and everyone what it really is instead of wasting everyone's time?
     
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