Possible Causes

Blocked circulation pump impeller, Defective circulation pump motor, Seized motor bearings, Faulty motor capacitor (if fitted).

How to Fix / Troubleshooting

Safety first: Disconnect the appliance from the mains power supply and close the water tap.

Check for debris: Remove the filters and inspect the sump area. Some Gorenje models allow limited access to the circulation pump impeller from inside the tub; remove any foreign objects.
Listen for pump noise: Start a cycle and listen. A humming noise without water movement suggests a jammed or failed pump.
Access the pump: Lay the dishwasher on its back and remove the bottom panel. Locate the circulation pump attached to the sump or heater assembly.
Inspect wiring and connectors: Ensure the pump connector is secure and free from burn marks or corrosion.
Manual rotation: Try to rotate the pump impeller by hand (with the power off). If it is stiff or seized, the pump must be replaced.

Replacing the circulation pump involves working in a confined space with water connections; if you are not experienced, seek professional service.