1. Kaidran

    Unusual Navien 003E Code + Solution

    Hi Everyone, I have just worked through a 003 error code, which was not supported by the Service manual. I could not find any record of this online so I thought I'd share in case anyone else sees the same problem. The point - the 150V supply from the transformer will mean the flame rod...
  2. NPE-240a2 4me

    Navien NPE-240A2 w/NaviCirc - when recirc feature is enabled, SCALDING hot water from showers when handles are moved to cold to warm.

    I've had a Navien NPE-240A2 installed since May with a NaviCirc at the end of my house. The unit does NOT have a T off the cold water line to the recirc inlet. The internal valve is set to EXT, the control panel is set to EXT with NO external pump. The recirc feature works as expected...
  3. Calibretto

    "WWSD On Diff" - How it Works - Navien NCB 240-110H

    I recently had the Navien NCB 240-110H installed in my home and I'm trying to decide on the appropriate setting for "WWSD On Diff". The only info in the manual on this setting is on p. 107: "Set the differential temperature to deactivate the Warm Weather Shutdown." Link to the manual PDF...
  4. Quark

    Navien NPE-240A and HotButton - DIP switches and parameters

    Re: Navien NPE-240A, Internal Pump Only, External Recirculation and DIY install of HotButton (PZZZ-00046). The HotButton Installation Manual does not mention DIP switch settings. It specifies one parameter setting: P.12 (HotButton pump cycle time). Q1: Should I leave DIP switches 1, 2 and 3...
  5. Dobson

    Help with return water dip switch settings (Navien NCB 240e)

    I’ll keep this as short as possible. I’ve read the manual and scoured the internet and have yet to find a clear answer here. I have a brand new Navien NCB 240e that so far has given me nothing but problems. However, I’m slowly finding out that my problems are from an incompetent installer and...
  6. Joe B

    How to properly use / configure Navien hydronic system

    Hi, Should a Navien hydronic heating system turn on and off four to five times an hour? I am living in a place with a Navien CH-240 that drives domestic hot water and an in-floor, six-zone hydronic heating system. The hydronic system uses PEX tubes under a concrete floor. I have only ever had...
  7. Mike_90503

    Navien NPE-240A Water Temperature Problem

    Hello, I checked through this forum, but couldn't find anything that seemed to address my problem. Here are the details of my issue, what I have done to address it, and finally, my questions. Water heater details: Navien NPE-240A Installed December 2013 External re-circulation loop installed...
  8. braindrain22

    Navien NCB 240e Combi Intermittent Short Cycling

    Hi everyone, Aside from the internal circulating pump failing in September, the unit has been running without issue since its install 5 years ago. Everything was in order during my annual service 3 weeks ago by a Navien certified plumber. Starting 2 days ago, I noticed the thermostat calling...
  9. Seth Rieder

    Need help dialing in Navien NCB-240E Combi boiler

    I am curious what the best settings for my system would be as the installer has been less than helpful. This is our second winter here and after heating the house last year with the in floor it didn’t like to keep up in the very back corner of our house which happens to be the master bedroom. I...
  10. Pmd5700

    Navien NPE-240A and NaviCirc Installation Question

    Hello, I just had my Navien NPE-240A (EDIT: It's actually an NPE-240A2) and NaviCirc installed today. First time tankless user. I was reviewing the manual and installation after they left, and I don't think they have the NaviCirc hooked up properly, and I want to confirm before I call them back...
  11. KevinL

    Navien NPE 240 A2 Flame Loss

    Hi All, I have a Navien NPE 240 A2 that was installed 3 months ago. I've noticed that in the mornings/first time I call for hot water the tankless will go through 4 short cycles before stabilizing and delivering hot water. The odd thing is the flow says 4.4-4.8 gpm which is inaccurate as I'm...
  12. Mike Drew

    Help Troubleshoot Monoflo ModCon Retrofit

    Hello! Apologies in advance for the long post, and thank you so much for any help provided! My home has 10 main floor radiators and 1 basement radiator, all cast iron and all fed by a monoflo system. We just had an old 1940's radiator (roughly similar to this one) replaced by a Navien NHB-80...
  13. DCouncil

    Navien NPE-240A2: Dedicated Recirc seems to make water cooler

    Hello, I recently updated my aging NR240A with a NPE240A2, and immediately it was a better experience. Water heats faster at fixtures, the fan noise is significantly less, principally in the 'post-purge' phase. After about a week of having it installed, i decided to create a dedicated hot water...
  14. Loucampy

    Navien combo unit .. noise with video

    Was wondering if anyone knows what noise this could be from... Its a combo unit 2 zones attached Only happens when the unit comes on for heating the house.. does not come on during hot water mode.... This is a YouTube video of the noise Thanks again for looking
  15. Wes Anderson

    Navien NPE 240A

    Six months or so ago I had an NPE 240A installed. I was set up with external recirc line (I think) but don't feel I'm getting much benefit. I'm waiting 1 min 30 seconds or longer for hot water to get to end of the line (kitchen sink ~60 feet from tankless). This is no big deal and I know it...
  16. Tony Fowler

    Tankless water heater. Abandoned by plumber

    We just had a Navien 240A tankless water heater installed to replace 2 conventional water heaters. Plumber said he would be connecting recirculating line to help speed hot water to far end of house that used to be on its own tank water heater. After he got all the piping done he said he still...
  17. Brooklyn

    Navien Combi Heats home but no DHW

    The Navien is a recent purchase and this issue started when it got really cold. The combi starts up to supply hot water to radiators but does not supply hot water. The water is running cold in all the shower and faucet. There is no error code. The flow should be high as I dont use faucets that...
  18. Monguila

    Navien NPE-210a - Preheat Off Offset Temp (P.15)

    Good day to all! Does anyone have experience with parameter P.15 on Navien's Npe210a heater? It is defaulted to 9. Factory settings sometimes are set to the "middle of the road," so I am wondering if it could be further maximized Thank you, Luis
  19. Benjamin

    Navien Recirculation Motion Sensor

    Hello everybody, I thought I’d share with you all how my hot water recirculation project is going. For the water heater I have a Navien-240A. For accessories I got the Hotbutton kit and two Navicirc thermal bypass valves. I set DIP switch #2 “ON” for external recirculation. I set Perameter...
  20. Santosh Krishnan

    Hot water in sink faucet but luke warm in the Shower

    We have 2 Navien 240 A units cascaded and brand new. The problem: The main heater is set to 130° and the cascaded unit synchronizes. When I open the shower, we get near instantaneous hot water that I have managed to measure at 120° or more. However, the hot water gets to lukewarm within a...
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