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Clem

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Hi all,

Came back from a week away and my combi boiler lost pressure completely which happen every now and then.
When I open the refill valve, pressure is going back extremely slowly (slower than usual)
After a bit it started doing a very hard knocking noise. Turned it off for now but unsure what is driving that.
The model is an i-mini
Any help or idea is welcome.
 

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