Dryer suddenly stop working

I owned this dryer almost 3 year. But one day after it dried the clothes perfectly, next day when dry again. it given no longer to work without any damage or short circuit sound. Refer to repairing manual it said it may be Machine Control Electronics Assembly may be worn. I turn power on, the panel lights up. When press the Start switch it can hear a click sound on M.C.E.A assembly, but motor is not running. I bought a new M.C.E.A, there show the same happen again. Will your Pro can provide me some hints to find out what’s the main cause of the problem for I solve it soon. Present moment, Turn the Power On, Press Start button, a Click sound come from the relay switch of the M.C.E.A . But the machine cannot start. Please Help ! ! !

I would first check to make sure i had the correct voltage going to the dryer.
How do I check the voltage to my electric dryer?

If the voltage is ok then I would check the thermal fuse.