Ariston LBF 51 the cycle appears to be finished but the red low salt indicator light, the red low rinse aid light and the yellow washing and 3h delayed start buttons are continually flashing. When I open the door the motor is humming and if I turn off the on/off button, it goes off then starts up again. The only way to turn it off is to switch it off at the powerpoint. What is happening and what can i do? thanks in advance, Rob