Diplomat dishwasher?

Our diplomat slimline dishwasher would just keep going and going, had to stop it and turn it off then make it drain. I don't think the water was heating up and nothing was really getting clean. Then it wouldn't work at all, just made a droning noise. Haven't used it for a couple of months and now it has started working again, though still don't think it's getting hot. Possibly the heating element? Can you buy these and replace them yourself?