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Thread: noisy knocking noise

  1. #1

    Unhappy noisy knocking noise

    Does anyone know what would cause an annoying "tapping" noise in one of our radiators upstairs.
    I have shut the water supply off to the radiator but within half an hour of the heating coming on this sort of tapping , knocking noise starts.
    Not that loud but very annoying.
    Is it something to do with the pipes expanding under the heat ??
    Is our water temp too high??

    Not sure - any help would be great


  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default tap tap

    No way of telling without hearing the sound and checking where it is coming from. Do you have hot water or steam heat?


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