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I have had a number of problems with a Worcester 28 CDI recently. The board had to be replaced as a circuit had gone. This didnt solve the issue which was then diagnosed as a faulty fan (which was very stiff to turn). It looks like one took the other out. Anyway, all fixed, less than 24 hrs...

Hi - Have a fault with a Sime Combi boiler. The Heating and hot water seems to work however i noticed that the boiler keeps firing up thenswitching off. The LED is green whilst running, then switches to orangs and stops. 10-16 seconds later (sometimes longer ) it goes green and fires up...