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Chris, Thanks for the reply. Presumably I need to replace rather than repair?

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)...

Thanks for all the replies. All useful. Drip from sensor that goes into diverter valve now fixed. Seems to be a PCB - left hand side - problem as when pressed boiler fires up. It's been on for two whole days now and a new PCB board is on its way which my local plumber is going to fit. Ta

Thanks for the reply :) I've found a very slight drip from the sensor that screws into the body of the diverter valve. When I turn the bolier to central heating constant, room stat up nothing happens, no fan, no motor - nothing. Hot water still working fine. Paul

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