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sorry also some of the radiators you can hear them as if they are filling up?

Thanks if I could ask another question? The boiler does stop the knocking noise after a bit and works fine. Would this mean the pump is fine? Also what is recoup?

I have a Biasi combi model M96.24SM/B making a knocking noise as if it is boiling up or has air in system. i have had all the heat exchanges replaced a new diverter valve and it is still knocking. This only happens when it is 1st comes on from 5 -15 mins boiler is working fine. Noise sound like...