F14 is a fault code the is telling you that you have a leak f14 is the code for the anti flood device so you have to fix the leak.
The leak is probably from the sump hose this is a comon fault as the weight of the drum causes the hose to rub on the base and leak, the hose from Dyson will cost you about £10 and is easy to fit the problem is getting the front off that can be tricky, so cure the leak and drain the water from the base and your F14 will go away.
Gary McDonald, March 2006
