Hi, I have a new cda wc480 intelligent dishwasher. It has only been used 3 times but is now showing f1 error code. , it is also flashing end. The machine appeared to have washed the dishes correctly but began beeping and then I saw the error code, I have tried turning it off etc but when I switch it back on it has the same problem, it is making a gurgling noise as if it is trying to empty but there is no water to get rid of. Help or advice required please