F11 is a no motor action fault, caused by a faulty component on the powerboard blowing the fuse, replacing the fuse won't do the job, the board is at fault, you need a new PCB. If you are good with circuitry you may be able to repair it, but it's much less grief to call Dyson, or trying to explain to the wife why she hasn't got a washing machine (it's worth the £95 believe me!)
Andy
December 2009