Worcester 28i Combi Boiler Knocking sound

[libbo]

Hi I have noticed in the last couple of days my 28i combi boiler has a knocking sound coming from it every couple of minutes. The sound happens when the heating is off and the hot water is not being used. At the moment the heating and hot water are working fine when either are being used.
The water pressure seems fine and does not appear to have dropped off.

 

[AWheating]

hi, you need to get a gas safe registerd engineer to take a look at it for you.

 

[Dotty]

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