If you have a faulty fan or blocked condensate causing the fan to stop working then you may get the blue flashing light on your Worcester boiler accompanied by the C6 fault code. The Worcester Bosch C6 fault codes means that there is an issue with the fan which could not be working for multiple reasons.. Anonymous user. Hi It will be one of 3 things. 1. Gas Supply The blue light on an RI will flash when it detects no gas supply, or low pressure. This could be a range of things such as a faulty gas valve. As this issue relates to gas, contact a heating engineer straight away. 2. Flue Blockages Another common cause of a blue light flashing is a.

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Dotty. Dec 29, 2015. #7. Get someone in who is both competent and qualified to work on gas boilers. Job 38.11. 1 person. Not open for further replies. Reply to Flashing blue light on Worcester Greenstar 28i junior in the Plumbing Jobs | The Job-board area at PlumbersForums.net.. Once you have located the button, press it for three seconds and then release it to start the reset process. Some models also have the "reset" setting on their temperature dials. The dial should reach the "reset" mark. It will stay there for three seconds before it goes back to its original setting.