There are several problems that can cause a dryer not to turn on. The timer running tells me you are getting voltage to the operator console as the timer runs off 220VAC. The motor, however, requires several things to working in order for it to run. The door switch has to be in working order and making contact as the door closes. An easy test is to push in on the door switch with the door open. If the light goes out, the switch is making contact. The following link I'm providing will give you some more pointers on what to troubleshoot next:
Read through the link thoroughly and make sure your dryer vent ducting is clean prior to replacing any failed components. It is essential that a dryer has proper air flow in order to operate efficiently. Some component failures are directly attributed to clogged ducting and will occur again if the problem is not resolved. Read through the section that decribes a dryer that "does not run at all". A common failed item is the thermal FUSE, which can fail due to overheating. If it is blown, it must be replaced. The component is usually white in color and made of plastic. It will be mounted on the blower fan housing inside the dryer.
The problems I mention, are the most common failures for this symptom. However, please check everything to ensure you rule out all possibilities. If you still need assistance, please let me know. I hope this helps you.