If you remove the back cover of the drier with the appliance un pluged, you will see the heater bracket.
un screw this from the back panel, and at the top you will see three thermostats. There is a brown one with a small hole in the middle, if you use a pin and press in, you should hear a click. This resets the thermostat and you should be able to use the drier again.
Apparently a common fault on these indicit based driers.