Our dishwashers are fitted with a self-diagnosis system, which in the rare case of a fault will help to report what the problem is. If the E15 or F15 error code appear on the appliance display it means that the water protection system is activated. We recommend that you do not try to resolve the issue on your own at home due to health and safety reasons. Please close the water tap and switch off the appliance. Book an engineer visit to have a professional rectify the problem.