Check the dryer's power supply. Make sure the plug is firmly inserted into the outlet and the outlet is receiving power. Verify the dryer is connected to a 240-volt outlet. Consult with a qualified electrician if you are not sure if the outlet is wired for 240 volts.
Check the dryer's fuses or circuit breakers. If the fuses are blown or the circuit breakers are tripped, the dryer can spin but not heat up. Replace the fuses or reset the circuit breakers, if necessary. Turn on the dryer again to see if it starts producing heat. Contact an electrician if the problem persists.
Confirm that the dryer door is firmly closed and you are pressing the "Start/Pause" button correctly. The dryer will not start if the door isn't properly closed. In order to start some heavy loads you may need to press the "Start/Pause" button for several seconds.
Contact a professional repairman, if none of these steps resolve the problem. You could be entitled to free service if your dryer is within its warranty period.