Macerator has only just been installed and is not operating at all with no noise.
Power Connection To Spur. This indicates that the power connection is not installed correctly. firstly disconnect the cable wires from the electrical spur and re-connect, it is very easy to miss judge how far the wires are pushed into the spur, this is a very common problem, an easy way to double check this is to fit a standard 13amp plug to the Macerator anbd plug it into an extension cable into another wall socket, this way you can eliminate any issue with the Macerator.
The Connection Spur. Check the wiring connections in the back of the spur socket, these may have become loose or disconnected. Check the fuse in the spur socket.
Macerator has been installed and operating fine but is now not operating at all with no noise.
Firstly check all of the above. If all checks out ok you will need to contact a Macerator engineer as this would now indicate a problem within the unit and will require a service.