i have an anet a8 with a lj12a3-4-z/ax sensor and it is "alwys on" so i do home all and it just goes up, i almost had to unplug because it was going to high

Post an Image of how you have it wired. By what you are saying it continues to rise this means it is thing that the bed is right there.
This happens when either the Sensor is incorrectly connected or the firmware is configured incorrectly.

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Computer Programmer / Electronics Technician