Hotpoint BF1620 dishwasher will not turn off only at socket. noise is like the continual pump of emptying dishwasher. tries changing programme, turning on off, keeps turning itself on and pumping

There is a malfunction of the washer controller. Hence the mode is not shifting off from the pump as it does not end the programme. Hence you will have to confirm the output of the controller if the drive is short or functioning by itself. Since even after changing the prog there is no change the controller must be replaced. Be sure to clean the pump to see if the drain is working fine. Try this out and hope you get the fault.Good day