On 25/03/2018 18:31, Harry Bloomfield wrote:
RJH explained :
Can anyone identify this noise? -

https://drive.google.com/open?id=1o_...flq4qiwX_jS6vh

It's a sort of high pitch metallic rattling, happens all the time, and
has started since I drained and refilled the closed combi system.

Water circulation pump, if it has one fitted inside the case, fan, or
simply something inside the casing loose and rattling.

it doesn't seem to be from the pump, more higher up in the boiler, maybe
the fan area. No obvious cause of rattles. FWIW, a couple of pics:

https://flic.kr/s/aHskQmv48Z


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Cheers, Rob