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Banging pipes in wall - forced hot water heat

collins1219
collins1219 Member Posts: 2
in THE MAIN WALL
Moved into a new house with a 2 year old gas fired forced hot water furnace. When heat comes on (especially at night!) there is non-stop banging in the walls. Had plumber look at system and he said no air in pipes. Expansion tank seems to be ok. I have no idea what to do next. Can anyone suggest a next step?

Comments

  • GW
    GW Member Posts: 4,795
    If you could be much more specific it may get you the answer

    non stop?? what are the intervals, and how might it be related to the thermostat (does it happen when the zone is off)

    are you positive it's banging and not a creaking ticking noise?

    Non stop seems a bit much, tell us more.

    How old is the house (how old is the heating system)

    Gary

    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    gary@wilsonph.com
  • collins1219
    collins1219 Member Posts: 2
    Gary - thanks for offering to help.
    House was built in 1987 - furnace is 2 years old. Heat is set for 64 degrees overnight.. Once noise starts it seems to go on regularly (last night - at least every 10-15 seconds, night before - every 5 minutes or so). House warms up during day so heat comes on much less and very little noise is present (or at least not noticeable).
    Noise is definitely a bang/thud in wall rather than a creaking or ticking noise. Loudness can vary from somewhat soft to rather loud (varies throughout the night).
  • Paul48
    Paul48 Member Posts: 4,469
    https://www.youtube.com/watch?v=r1ecdBTzbRE
  • wcs5050
    wcs5050 Member Posts: 131
    Sometimes when zone valves reach a certain point of wear, they can close quickly, creating amazing water hammer. Do you have zone valves?

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