What does it matter whether the wall is warm or not?

There may be the following reasons: 1, the power cord of the electric heating plate is loose, or the contact is poor. 2. The wire is damaged, so it can't supply power. 3. The heating element is burnt out, so pay attention to the danger of electric leakage at this time. 4. The heating element is overloaded, resulting in short circuit. It is recommended that professional electricians or factory personnel carry out maintenance.