Well, first you need to check and make certain you are still getting 240 volts to the machine. Sometimes the breaker will partially trip and send enough power to operate the machine but not enough to cause the heating coils to come one.

If this is not the problem, and likely it is not, then you need to open up the machine and do a continuity test on the thermostats and safety fuses. Be sure and disconnect the power to the machine when doing this.

If you find this is the problem, take the opportunity to also thoroughly clean out the venting system. Restricted air flow is the single largest cause for a thermostat/fuse failure.

Good luck, and post the results. If you do not find the problem let us know also.