potterton suprima.
put central heating on to heat up water in tank but in less than half an hour hot water starts to flow into radiators.Before I could heat water up in tank and it would not flow into radiators surley the boiler cannot heat up a full tank of water up in less than half an hour. I have checked all the controls and thet are still set the same as they have always been.

David, July 2013

For hot water you have to set programmer HOT WATER only ,surely if programmer on HEAT AND HOT WATER than water will flow both side or if you have room start turn it to off position 0 ,if still problem Engineer as to look if three port valve is fault

ltd, July 2013