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  1. #1
    Join Date
    Dec 2008
    Posts
    12

    Default HW baseboard bangs when shuts off

    Hi, this is my first post. I have a hot water baseboard system that recently had the air bleeder valve and a zone valve replaced, ever since the zone valve was replaced I get the hammering noise in the pipes but only when the furnace shuts off after it has reached the tempature. I have spent time sitting in front of the boiler to try to see what is banging but it never happens when I'm watching it. it only does it once in a while but it bothers me knowing theres a problem. the system was bled twice by the oil contractor and I check the schrader valve on the air purge and it only hissed out a tiny bit of air once. any ideas?

    thanks

  2. #2
    Join Date
    Feb 2008
    Posts
    556

    Default Re: HW baseboard bangs when shuts off

    Comsec1:

    This could be an air problem, but more likely it sounds like a loose connection on the zone valve.

    Your unit is referred to as a boiler, never a furnace.

    Could you post the model & make of the zone valve.

    The installer who did the work should come back free of charge to check this out & correct the problem---why don't you call them now, while you're thinking of it.

    Some models of zone valves will clatter or bang at the end of the heating cycle if the hold-down screws inside are loose.

    It's always more effective to bleed air from the highest baseboards---upstairs in the living quarters (if you have bleed valves in those baseboards), since air in piping always migrates to the highest point in the system.
    Last edited by NashuaTech; 12-13-2008 at 12:53 PM.

  3. #3
    Join Date
    Dec 2008
    Posts
    12

    Default Re: HW baseboard bangs when shuts off

    thank you for the reply, the zone valve cover says it is a honywell. I can not find any bleeders on the system other than the air purge at the boiler.

    thank you

  4. #4

    Default Re: HW baseboard bangs when shuts off

    Was the complete zone valve replaced or just the power head? If the valve is installed backwards it will most definitely bang on closing.

  5. #5
    Join Date
    Jan 2008
    Posts
    731

    Default Re: HW baseboard bangs when shuts off

    Quote Originally Posted by comsec1 View Post
    I had posted about a problem with my hot water base board banging(water hammer) when the zone shut off. the problem was the new honeywell zone valve that the oil company service put in.
    after 3 house calls for the same problem their lead tech was sent and removed a spring on the valve that assists closing the valve. he said they have received many complaints of this and honeywell said they had changed this spring to a heavier spring. spring is not needed and now I can sleep. hope this helps others if needed and thanks to the people who replied
    It was nice to hear that you resolved this problem. I'm quoting your follow-up post which you placed on another string for the benefit of those that actively participated in your original topic string (here).

    This is a direct link to your follow-up (new topic string): http://advice.thisoldhouse.com/showthread.php?t=10318

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