HEATING DEVICE

PURPOSE:To enable to prevent a microcomputer from uncontrollable operation due to noise and the like by a method wherein a microcomputer to control the action of a second switching means is provided and at the same time a first switching means is put into actuation so as to cut off power source for a certain fixed period of time. CONSTITUTION:A second stop switch 7' is provided between one terminal 17 of a power source 18 and the power source input terminal 16 and interlocked with a stop switch 7. The second stop switch 7' is so constructed as to close normally and open when the stop switch 7 is pressed. A reset circuit 15 to bring a microcomputer back to its initial state is put into actuation by the on-off action of the power source. When the stop switch 7 is pressed in case that a microcomputer runs away due to noise and the like and a relay control signal R8 remains to be high level and consequently continuous heating state is developed, the second stop switch 7' is put into actuation by interlocking with the stop switch 7, resulting in turning the power source OFF, turning the reset signal to be high level in order to bring the microcomputer back to its initial state and forcibly turning the relay control signal R8 to be low level in order to stop heating.