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My Worcester Bosch Greenstar Combi boiler digital display has started flashing the temperature then two half-rectangles alternately ... it is not heating the radiators to full capacity - any ideas?

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Just had same problem.  this apprently happens if the power supply has been interrupted or you switch the power on and off.
• The boiler runs for 15 minutes at minimum heat output to fill the condensate trap, the display (K) alternates between -II-” and the boiler flow temperature. This occurs every time the mains supply has been interrupted.

Posted on Jan 07, 2009

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