What you need to do is get a copy of the wiring diagram for your washer/dryer combo from Indesit. That will allow you to understand how the thing is supposed to work.
But, typically electric dryers will have some sort of high limit control so that if the dryer gets too hot, the high limit control will shut off power to the heating element. In some cases, this high limit will reset itself once the dryer cools down. In other cases, you need to replace the high limit thermostat every time it blows.
If you have more than one temperature setting on your dryer, try the other temperature settings. That will eliminate the possibility that it's just a bad thermostat.
But, you need to get a wiring diagram so you can identify each of the parts in your dryer so you have an idea what each one does.