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why are radiators getting hot when in hot water mode ?

i have a ariston eurocombi sx20 when having shower the nearest radiators get hot as well what may be the cause ?
Could it be the diverter valve is on its way out ?
ash, June 2008
Diverter valve buddy....poss change diaphram inside, not whole assy.£20-£30 quid+labour

Lloydy, July 2008
its a combi boiler, not a system boiler

sonray heating, June 2008
Yes I think so - this is usually a sign of a diverter valve sticking. With luck you'll just need a new power head that contains the stepper motor.

John, June 2008
link Click here to see other fixes for Ariston Eurocombi SX20.