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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

    ian

  2. #2
    Moderator & Master Plumber hj's Avatar
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    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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