How do I check a dishwasher element?

The only sure way of checking if an element is gone is with the correct testing meters. Either a resistance meter across the terminals of the element to check if its not open circuit OR an insulation tester to check the insulation resistance , which with the fault you describe may be whats required. Plug out before any testing or poking about but you'll probably need an engineer to test it fully (or take a punt and change it anyway).

TC
December 2008