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ariston microgenus 23 mffi ?

My boiler's hot water goes hot & cold when running.It also heats the radiators when hot water is running.It also sometimes leaks water from the top of the diverter valve when the heating is on.Can anyone help please?
lib, June 2012
plate heat exchanger & divertor valve clogged up
need cleaning or replacing

manwithnoname, June 2012
link Click here to see other fixes for Ariston.