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How can i check if the pump is doing the job.

Thanks foryour reply exact model is aristonmicrogenus 11 checked pump by removing brass screw to check impeller is turning which it is. How would i check for restricted flow

I have ariston combi boiler hot water no problem when I turn on central heating boiler fires temperature is reached in seconds and cuts out no heat in any part of the system checked pump no problem completely drained and refilled system bled system no result any ideas welcome