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Hi, I have the same boiler (8 years old) and exactly the same problem. I have been told three possible causes: 1) Heat exchanger scaled up. Solution descale. 2) Either faulty diverter valve (cheapest price about £42 on web) or falulty flow switch (cheapest price about £20 on web)...

Hi, I have the same boiler (8 years old) and exactly the same problem. I have been told three possible causes: 1) Heat exchanger scaled up. Solution descale. 2) Either faulty diverter valve (cheapest price about £42 on web) or falulty flow switch (cheapest price about £20 on web)...