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Dec 19, 2019
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Hi,

I have heard knocking from the front of the house pipes/radiators? for about a year now. I can hear it when sat in the living room and also the bedroom above it. All night, every two minutes a knock knock knock - three times always on the dot. Especially when its cold or the radiators have been on and cooling. I understand the metal contracts but this sound different to that tapping.

I have bled them for the first time in years but nothing came out but lots of water straight away. Is there anything else I can do or what is causing this as it wakes me up numerous times every night. Thanks.
 
Sounds like pipes rubbing against something.
Might have to lift some floor boards to investigate
 

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