No water filling up in the dishwasher when programme set

My instinct would be to replace the water inlet valve without even trying to prove whether that is the real problem. The valve is the plastic unit on the back wall of the cabinet that your cold water hose screws onto. I think your dishwasher takes a Universal 90 degree Single inlet cold water solenoid valve, which you can find unbranded on the net for under £10. Provided you remember to turn the power and water off before you start, there are no hidden surprises in the replacement procedure: Remove the inlet hose, undo the screws attaching the valve to the cabinet, unplug the two wires, unclamp and remove the hose inside the dishwasher, then reverse the process to reassemble. After assembly, check that the hose to valve coupling is watertight. Granted, the problem might conceivably lie elsewhere, but the valve is so much more likely a culprit, so cheap to buy and so easy to fit that you might as well change it on spec. A.

If the pump is constantly running
the easy way to check is to open the door and switch the appliance on if there is a noise than the anti flood system has been activated
which means you either have a leak somewhere in the appliance or you have been visited by a rodent which loves to eat the polystyrene anti flood float
the easy way to get your dishwasher working is to take off the rhs panel two screws torx t 20 lift off the top and then drain the water from the appliance in the space next to the motor housing
this will get your dishwasher working but it wont fix the leak
good luck that would need to be done by a pro is it can be complecated depending on where the leak is

Your pump needs replacing