Do you have a Volt ohm meter?
and will it tumble on every cycle ?
ok You will need to pull it out away from the wall ,unplug the dryer from the outlet .
And lets remove the rear lower panel .
You have a thermal fuse with two blue wires on it .
Bypass the thermostat by putting the two wires togeather and plug tghe unit in and start the unit and see if it heats ?
ok then you would have a bad heating element.
Here is a link to the part .
yes Here this will show you how