Dishwasher problem - heater

[JayNTray]

It has two flashing lights which according to Indesit is the heater. Because the machine is getting red hot and throwing steam out when you open the door, they reckon it's over heating and will need a new heater. In addition to this the top arm doesn't appear to be spinning.

 

Now they refuse to give me a repair price over the phone so we can all guess what that means (usually it's cheaper to buy a new one after the visit charges, parts and labour), so does anyone have an idea of how much it is likely to set me back?

 

Thanks J.