greenstar ri gas fired condensing boiler no hot water or heating blue light?

Hi I have been reading all the other letters and it seems we could be frozen in the condenser pipe. But I dont know which is the pipe? We have had no heating or water now for 3 days and we are freezing.When I tried to start it up the green light flashes and you hear a brrrrrrrr noise then the blue light starts flashing again.My set up is in the airing cupboard with boiler in cupboard underneath if that is any help to you.hope you can help me thanks