When hot water is on, heating cools down

no.

if its a combi boiler it does (mine does, since it can only do 1 thing at a time)
 
sorry about info. The boiler is a Potterton Netaheat 60e.
i had the heating power flushed about 4 months ago. It has two 2 port valves. One for hot water and one for heating. When both valves are open there seems not to be enough pressure to do both. Could i need a new pump?
 

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