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Hi all you experts out there. My boiler fires up no problem and is delivering central heating and hot water. Boiler shuts down fine if you dip the central heating thermostat but during hot water cycle once you turn off the tap it keeps going, makes one hell of a noise until (it sounds like)...

I've just had my Potteton Puma 80 combi repaired. It was firing up for hot water but no central heating. The diverter valve was replaced and for three whole days we had CH and HW. But now no CH again. Could the diverter valve have gone so quickly?? Any suggestions gratefully received