Hi.
Empty the drip tray, then disconnect power for ten minutes.
If that does not work, then that means that a maintenance procedure was started, but had not been completed.
In that case ensure you do COMPLETE the maintenance procedure below, click on the picture to enlarge:
If still no luck, then the sensor in the drip tray may be faulty, clean the drip tray and eventually call Jura at the number listed on the owners manual to get instructions on how to get repair service.
Regards.