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Hi Tony They were Honeywell valves and looking very tired, so thought it best to replace them both at the same time. Do you think it could be the thermostat on the side of the cylinder that is playing up, anyway I can test this before replacing. Regards

Thanks for the reply, The programmer lights come on when I select HW and CH, it appears that only the valve for the CH is responding, the HW valve Manual /auto selection is stiff, ie same when the programmer is off. The boiler fires up when I select the CH option, but does not fire up when I...

Can anyone help, Potterton Kingfisher Gravity Fed Boiler, No Hot Water, Central Heating works. Replaced 2 way valves, both tanks in loft full of water. Electric immersion heater works when switched on and full flow of hot water, can not understand why boiler will not heat water when switched...