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chris you are a star !!!!!!!!!! cleaned off mechanism and now works fine thanks a lot

yes chris works fine

hi i need help with my boiler i have a biasi 28s its about 6 years old the dhw does now work unless the ch is on but if you open the tap without the heating on the boiler tries to start i think its the flue fan i can hear but will not fire and after a few seconds it goes into fault mode...