DeLonghi doubleoven electric cooker ESS602

It is hard to know exactly from here. I'd suspect the heater element is open before anything else. If you can get to the terminals of the element itself (unit unplugged!, element disconnected on at least one side), then test for resistance with an ohm meter...available at any electronics shop or large retailer like Radio Shack, Sears Hardware or the Depot.

If there is none, the element is bad...hint: defective elements often have an area on them that is discolored differently from other parts. Food particles, particularly grease splash, will cause burnout. Terminals or connectors that are loose or corroded will cause non-function or failure. Look for those issues. Make sure all connections are tight when you're finished.