Common reasons why the box-type resistance furnace does not heat up

1. The grid voltage is too low;

2. The unbalanced value of the three-phase current exceeds 20%;

3. The electric heating element is open circuit or lack of phase;

4. The resistance value of the electric heating element does not meet the requirements;

5. The power of the electric heating element is reduced;

6. There is a short-circuit phenomenon in the electric heating element;

7. Too much furnace charge;

8. The performance of the heat shield or furnace lining is deteriorated, and the heat dissipation is too large;

9. The connection method of the electric heating element is wrong;

10. The output voltage of the furnace transformer is low;

11. The output power of the power regulator is too small;

12. The temperature control device is malfunctioning.