Combi boiler loud drill like noise when turning off hot water

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3 Nov 2020
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United Kingdom
Hey guys looking for some advice, I have a combi boiler (ideal isar)and when turning on the hot water from any hot water tap and then turning off just as it ignites or just after I get the below noise:

https://streamable.com/bodqvc

It’s like someone’s drilling in the boiler, it’s not coming from any pipes but the inside of the boiler itself like the video seems to show. It is an older boiler and its just gotten serviced but the guy didnt seem to fix it, it’s annoying hearing this whenever I turn off the hot water, this doesn’t happen when using the central heating and if I keep the hot tap on long enough and turn it off the noise doesn’t happen.

Any advice ?
 
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