Normally it’s a flow meter failure.
- Unplug the machine from the wall socket.
- Take the left side panel off (looking from front).
- On the bottom right of the plastic fill chamber you’ll see a water wheel/disc, disconnect the plug from this, clean the contacts on the small pcb, tighten/squeeze the connections on the connection multi-plug and fit it back on.
- Reassemble the machine. Plug it back into the wall socket, reset it and use the programme again.