Your Cafitesse Excellence Compact Black gives displays fault code 17 (small leakage). The water valve is probably leaking, sometimes it has not been fitted quite correctly. This fault only appears if your coffee machine machine is connected to the water supply. You can't fix this yourself, unfortunately, but you can prevent the situation from getting worse.
Follow the 2 steps below and contact the troubleshooting service.
Unplug the power cord
To prevent a short circuit, unplug it.
Shut off the water supply
Shutting off the water supply will prevent water from entering the coffee machine. This way you limit any damage.