Thanks i was hoping some one would tell me just the part could be replace and not the whole fan, but if it's the whole fan i better prepare myself for some costly quotes.
My boiler keeps tripping the RCD switch, i've had a look at it (not planning on doing any work myself), it seems that there is a metal circular part in what i think is the fan that is loose, instead of going around it vibrates up and down then starts spinning a little then back to vibrating as...