The fuse may have blown because one or more of your wipers was frozen to the screen(s). This is to protect the motor(s) from overheating when they can`t actuate the wipers. first, while not freezing, give front & rear washers a good flushing through, a minute say. Then Top up the washer resevoir with high proportion of anti freeze SCREENWASH - not the anti freeze for the radiator which eats paintwork! Secondly, when you dei-ce the windows, manually free the rubbers from the screen(s). A little squirt of de-icer may assist on particularly cold mornings. Thirdly, buy yourself a screen frost deflector for the front.