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Thought i'd read a little before calling a CORGI engineer out, glad i did now after reading the 'BIG DEAL' topic. I have an Ariston MicroGenus 27 Combi, it was fitted about mid June, but we have only just moved in, everthing works fine throughout the day, but when it is left standing over night...

recently changed to a fully pumped system from gravity hw, but water seems to now be pumping straight in to the f+e tank in the loft, tried turning down the pump,no good, even does it cold, striaght from switch on.any ideas?the reason for the change is due to the old boiler(ideal concorde) died...