We have 2 electric showers, one in main bathroom and one in ensuite. Today, they both are making a really loud noise when switched on, and sound like they will explode! Water pressure elsewhere else, seems to be ok. Do you think I need a plumber or an electrician to check what's wrong? Does anyone hazard a guess what's wrong. The fact that it is both showers suddenly playing up seems like it's a general problem rather than a specific problem with shower. Any ideas anyone??