Here are the steps I would take for a electric dryer that does not heat.
1. Check the voltage to the dryer. You should have 240 volts. It you only have 120 volts the dryer motor will run, but you will not get any heat from the dryer.
If you have house breakers chances are the voltage to your dryer is just fine. The only way to know for sure is to check with a volt meter.
If you have house fuses then there will be two of them for the dryer. You could have one bad fuse and one good fuse. If you don't have a ohm meter to check the fuses or they are not the type of fuse you can just look at to see if they are bad then replace the fuses and try the dryer again.
2. Remove the back of the dryer and check the thermo-fuses or safety thermostats with a ohm meter. They are on the heating element. In your case maybe a wire come loose when the time was being changed.
3. Check the heating element at the back of the dryer. You can check the heating element with a ohm meter or remove the element from the canister and look at the element for a broken spot.