We have recently had 2 workcentre 7830's installed and have an issue with the energy saver feature on one of them. The machine never enters energy saving mode and if you press the button on the printer it displays "The Customer Service Engineer has disabled the Energy Saver feature". I have compared the energy saving page on centreware and both machines are identical.
Both machines are running the same software and the problem machine has been rebooted numerous times but the problem persists.
It sounds like the Engine energy saver is turned off. You will need a visit from a technician to turn it back on. This can only be done by the technician in diagnostics. The page you are looking at is the network controller energy saver.