Why is the boiler not starting up?

1. Water and electricity are not available;

2. Circulating water pump is not running;

3. Water flow switch is different;

4. The 200V 380V power supply is not connected;

5. The valve is not opened;

6. The controller switch is set incorrectly;

7. There is a problem with the controller circuit;

8. There is something wrong with the programmer;

9. Leak detection has not been checked;

10. Air pressure switch impassability;

11. Air pressure switch 1-3 impassability;

12. Overtemperature protection and combustion heat protection;

13. There is a problem with the burner circuit;

14. Pressure switch protection;

15. There is something wrong with the insurance.