There may be multiple reasons why electric ball valves cannot be opened. Here are some common fault analysis:

1、Power failure:
Check if the power supply is connected properly and if the power cord is damaged.

2、Controller malfunction:
Check if the controller is working properly, if there are any faults, and if it needs to be replaced.

3、Electric actuator malfunction:
Electric actuators may have issues such as motor failure, travel limit switch failure, or mechanical component damage, and require inspection and repair.

4、Pipeline blockage or valve jamming:
Check for foreign objects or impurities in the pipeline, clean the pipeline or disassemble the valve for maintenance.

5、Control signal transmission failure:

Check whether the control signal transmission line is well connected, whether it is affected by external interference, and whether it needs to be readjusted or replaced.

The above are common reasons for the failure of electric ball valves to open. Diagnosis and troubleshooting can be carried out according to specific situations.