Worcester Bosch 28i Junior Banging Noise

30 Jun 2021
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United Kingdom
Hi everyone,
Moved into the house in December 2020 and ever since then there has been a banging noise from the boiler. It's so loud, especially at night it scares the dog! To us humans, it's just very frustrating!

Had British Gas out twice, they have checked the boiler and can find nothing wrong with it, so just wondering if anyone else has had a similar issue? No idea what causes it, at a guess, it's when the boiler is cold, has to do something and then makes the noise when shutting down.

I've managed to record a 25 second video of it. At the start, i'm running the hot water. You hear the boiler spring into life and do it's thing. At 20 seconds, the boiler starts to shut down and that's when the 4 clunking noises start. It's one of those noises that seems to seem louder round the rest of the house.

Any help or ideas appreciated!

British Gas the last time they came out said to keep a log, to see if there is a pattern, but struggling so far as it seems a bit random. The boiler is a Worcester Bosch 28i Junior.

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Put it in eco mode (press the button till it glows orange) to see if the banging is only occurring when the boilers in preheat mode.
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No joy with Worcester Bosch unless they came out to have a look.
Had British Gas back out again today, engineer was very good. He changed the diverter valve, but still no joy. He thinks it's the pump as it's shutting down, so has ordered one and will be coming back next Thursday to replace it. Fingers crossed!

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