Humming or buzzing noise in the loft?

23 Mar 2021
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United Kingdom
Please can someone help me! I have a really loud humming/buzzing noise coming from up in the loft, where my water tank is.
I purposely haven't had my heating on or used much hot water for a few days but still the noise randomly starts up.It seems to be worse after a shower, when I've done some washing or flushed the toilet.I have a Combi boiler if this is relevant.
Any ideas what is causing this & any remedies please? It's nearly 4am & the noise is now driving me crazy! Any help or advice would be greatly appreciated! Thank you :)
Last edited:
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Try going up into the loft to locate the source of the noise, seems to be the obvious answer?

Why do have you a water tank in the loft, with a combi? The tank fill float valve is a common source of such noises.
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Combi or Condensing ? Do you have a hot water cylinder ?

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