1. Only the positive and negative electrodes are short-circuited with the circuit, the boss will not work and the oven will not work. Therefore, in the process of connecting the power supply, it is required to be at least 30 N and must be grounded.

2. Don't suck power when the positive and negative electrodes are in contact, which will cause short circuit. Will cause the boss not to turn on the oven.

3, in the process of contact, the action will cause large current and poor slip line. It's caused by overcurrent. When wiring, be sure to connect carefully to avoid damaging the wires.