1, power supply problem: the electric cotton trousers need an external power supply. If there is no power supply or insufficient power supply, the electric cotton trousers will not heat up.

2. Circuit problem: The circuit of the electric cotton trousers may be out of order, resulting in that the electric cotton trousers cannot be heated.

3. Temperature control problem: The temperature controller of the electric cotton trousers may fail, resulting in the electric cotton trousers not heating.