A G3 machine is as shown in the image below, the machine has a screen:
BIB empty - you can change your BIB following the guide at this link
CO2 or water empty - you can replace your CO2 canister using the guide at this link
Overfilling or CO2 leak - call customer services on 020 8578 5785 to log a job
Clean filter - you can clean the filter following the guide at this link
Machine requires a service - call 020 8578 5785 to log a job