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The model number is alpha CD30S and the 'B' light is solid not flashing. It normally runs for a few hours before cutting out Thanks in advance for any help

Hi Got an alpha boiler (2years old) not sure of model but it runs the heating for a few hours then cuts out. The 'B' orange light then flashes. I can restart it by reseting the dial but a couple of plumbers have come round and scratched their heads and haven't really had a clue. Could...