My Latch Light Never Comes On. It Stays On Close Speed

The arm may have been installed wrong. To reinstall the arm, remove from spindle and put rocker switch to hold open. Put door at 90 degrees to frame and reinstall the arm as per instructions.

You may also have a cam orientation issue on top of the motor gear box where the back check and latch limit switches are controlled. Follow the chart below to re-position cam: