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If you can't solve your problem thanks to the below listed answers, please
1 - The actuator does not work (the valve is not rotating).
2 - The valve doesn't open or close entirely.
3 - The position indicator gives the opposite position compared to the valve.
4 - The actuator works in one direction only.
5 - The feedback limit switch on opening or closing does not work.
6 - The actuator stops an drives slightely backwards.