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Knight Lochinvar

rpeter12
rpeter12 Member Posts: 3
in Gas Heating
I have a knight high efficiency boiler that is in its fourth winter. The first winter it started making noises like a wounded elk. Most often during the coldst part of the day. We had the installer out several times and they said it was fine. No noiSe when they were here. The next winter the same thing only This time something was cleaned internally and a board of some kind was replaced. All well the rest of the winter. Good all third winter. This winter the elk is back worse than ever. Wakes me up thre or four times a night. Neighbors even complain about the noise. Any ideas?

Comments

  • JohnNY
    JohnNY Member Posts: 3,291
    Like this guy ^ ^ said, it's a combustion issue. I've only ever heard it (3 or 4 times) when a high efficiency boiler's exhaust is crossing over into it's intake.
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting & Troubleshooting
    Heating in NYC or NJ.
    Classes
  • Ironman
    Ironman Member Posts: 7,547
    edited December 2016
    I've had several do it and usually adjusting the fuel throttle to allow the highest co2 within specs fixes it.

    As others said: make sure the tech has a combustion analyzer and KNOWS how to use it; very few will.

    This has been thoroughly dealt with and answered on previous threads.

    Search the site for fog- horning under my handle.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • rpeter12
    rpeter12 Member Posts: 3
    Thanks folks for the wisdom . Now just trying to find a contractor who will answer his or her phone or get back to me.
  • Heat_n_CT
    Heat_n_CT Member Posts: 64
    They're all playing around on the internet all day ;)
  • rpeter12
    rpeter12 Member Posts: 3
    I found someone to come out and take a look. They think it is the gas valve. Their reasoning is that since it only happens when it is near zero temp the gas valve is not compensating. I did have that valve replaced after the second heating season and it did solve the problem for one year. I guess I will see what happens.
  • Ironman
    Ironman Member Posts: 7,547
    edited December 2016
    That's not the problem. Listen to the advice that's been given by the pros or you'll be wasting $$ for nothing. The gas valve doesn't "compensate". The modulation is controlled by the computer changing the speed of the combustion blower.

    Did they even do a combustion analysis? If so, what are the numbers? What's the inlet gas pressure under min. and max fire?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
    njtommydelta TSWEI

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