Zanussi ZDT41 error

Hi, I was wondering if anyone can help.

My dishwasher has decided to stop working. The display has one black button to select the cycle and to also cancel.
I have re-set the system by holding the cancel button down. I then select a cycle and after shutting the door it seems to make a noise as though it is going to start, but then stops.
After then opening the front the end of programme LED light constantly flashes and the salt LED is on constantly.

Having called zanussi I think they said that there is an issue with the pcb or something similar.

Does anyone know what this is and if I will be able to fix it to save paying for an engineer.

Model is ZDT41 integrated washer.

Thanks in advance