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radiators come on when running hot water?

I have a sime super plus 90 boiler and the radiators come on every time I run the hot water even in summer mode, and some times the boiler pressure rises dramatically
amanda, July 2011
very common problem with all combi change diverter
valve and presure vessel need recharge

lal, August 2011
link Click here to see other fixes for Sime.