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    Potterton Suprima no hot water unless central heating on too

    I have a Potterton Suprima 60L boiler. When the HW (only) comes on, the gas ignites. After about a minute, the red LED comes on with green LED flashing (to indicate there is no longer a demand for heat) and gas is extinguished. Shortly after that the red LED goes out with green still flashing...
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