washing machine?

First port of call: Find the manual. Read it.

No manual? You could have searched for one. Try this: http://www.indesitservice.co.uk/category/laundry/

You could have even searched for the Indesit F10 error code yourself. Took me about 40 seconds to locate this, which may help:

http://www.espares.co.uk/advice/0/2561/identifying-hotpoint-or-indesit-error-codes-

XXX
January 2016