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hi guys thanks again for all the help and ideas finally it was corgiman who picked it with his chance remark 'can you hear the fan' which kind of fits with what the manual said about the rapid flashing DFW light being due to a 'blocked flue' Indeed looking at the fan, it was immobile...

Hi Thanks to everyone for their time and suggestions but sadly still no joy with a) switching off at mains or b)boosting the water pressure to 2 bars. At first the rapid flashing light no longer flashes a fan starts (I feel hopeful at this point) then the light starts flashing again and the fan...

you turn the grey knob as well :idea: kevplumb - a great suggestion!-the system pressure quickly got to 1 bar I pressed the reset button; the flashing light was gone but.... still no HW or CH tho the relevant lights came on - then the cursed light (next to the pic of the tap) started...

Hi I have a Worcester 24cdi combi boiler installed 3 yrs ago by a plumber in the loft above the flat. There have been no probs till yesterday when we woke to no hot water or CH. The boiler hums and the light next to the picture of the tap (on the front) flashes fast. This means blocked flue or...