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Yeah just jumped in without thinking a bit went down line of overtemp cut off being faulty not why it's overheating

Thanks for the reply. Think I'll try swapping out thermostats first probably the cheapest option. Would ou agree?

Have a ferroli optima 701 old but been ok apart from the odd temp sensor and o'rings. But when dhw on rads are warming up. I know theres no diverter valve on it so how is it controlled and what are possible issues if any one can help i'd be very grateful. Would it be the modureg?