1. First of all, the switch light of the 3d tourmaline hyperthermia mattress is turned on or off for a long time, or the high temperature gear is used for a long time, which leads to the aging and disconnection of the heating white alloy copper wire.

2. Secondly, there is an open circuit at the connection between the internal controller and the heating wire.

3. Finally, the internal controller lead connected to the heating wire appears virtual welding phenomenon.