Re: lsv66 Ariston Dishwasher
That is a question that only you can really answer, do you have any electro mechanical experience, do you have the required test equipment?
Whilst it could be the heater that is at fault the thermostat itself should not prevent heating, however a safety stat would. Fault could also be due to control timer or breaks in wiring harness, or other component failure.
If you do decide to take a look please remove the mains plug before you do and remember that most modern appliances have some very sharp edges.
Can you see any obvious fault on the heater, does it look warped or split ?