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Would a faulty pump cause the hot water not to work?

I have a 3 year old Halstead Ace High boiler. 4 Rads upstairs 4 down. 1 rad downstairs is hot the others downstairs are luke warm, upstairs get fairly hot. Other problem is the Hot water, Boiler fires up and hot waters starts to flow then the boiler over heats and cuts out for about 20 secs then...