The thermostats are located on the back of the heater element at the back of the dryer. You need to remove the buldge cover on the back there you will see the heater. Remove this and turn it over and there you will see 2 thermostats. You need to test them for contonuity. If any are faulty then you neeed to replace the heater as it comes as a complete unit
There is also an NTC sensor probe in the air dut. To access this you need to remove the top and then remove the right hand side panel.
Then looking at the bottom left corner you will see the NTC sensor there. It will have to thin wires to it.
Again with you multi meter test the resistance. Its usually around 7K ohms roughly so if out of range or open circuit then you need to replace the NTC sensor.
But if you find the heater/ thermostats and the NTC sensor are all fine then all thats left is the control board. In this case the board will need to be replaced.
As on vented dryers all you have in there is heater, NTC ,control board and motor. Now a motor wont cause it to stop and flash the start light.
So check the heater at the back and the NTC on the bottom right hand side and if they are all ok then you are looking at a circuit board fault im afraid.
If you need anymore info just get back to me.
If you got 2 ohms on both the thermostats then they are ok. It will be faulty if you didnt get a reading on them so as you got 2 ohms then they are fine.
So you need to check the NTC sensor on the right hand side and see what you get on that.
But if thats all ok as well then its looking like a faulty control board here im afraid.