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8 rads of which 2 are large rest are med or small. The boiler is still kettling just after firing up. I cleaned the diverter valve pin and spring today. I also took the pump head off and found 3 small stones or rocks in the housing. As yet i do not know what they are. I am soaking them in...

The pump does not have enough guts to make all radiators hot. I have had the system flushed twice with sentinal x800. its the pump or the main heat exchanger that neesd changing.

I have a Ariston Euro combi A/23 MFFI and am looking to replace my circulating pump which is currently a WILO GOLD 50v with a single speed setting(A 0.38/W 88/RPM 2200) What would be a replacement pump that has a higher speed setting. I have been led to believe PART 996613 is a replacement part...