Worcester-Bosch Greenstar 30Si two short bursts of noise when call hot water or heating

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Worcester-Bosch Greenstar 30Si (G.C. No. 47 311 85 N.G.)

Had a new Flow Unit fitted as previous had developed a pin hole leak. Also topped up system inhibitor. Then this noise has appeared.

I'm going to checking if anything that is easily accessible is loose, but apart from that I could use any pointers from anyone that has experienced this issue or recognises the noise.

System controlled by a wired Honeywell programmable thermostat.

Link to 8 second video:
https://imgur.com/0eVOh9T
 
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Joined
16 Sep 2014
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0
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Yes, it was the diverter valve.

Had the control panel down while trying to find source of noise and the diverter valve fell out of its holding block. Looked like it was not pushed in correctly so clip that would engage at back wasn't connected.

Red circle is the block that diverter valve locks into.

W15r2pw.jpg
 

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