When your CHT2 control panel displays a "241:Needle Error," it indicates that it's not at a specific needle number.
This issue can be resolved by ensuring that the main axis is at 100 degrees and that all the take-up levers on each of the heads are at the same height/position.
To correct this, please follow the steps demonstrated in the video linked below
CHT2 241 Needle Position Error Video
By following the instructions in the linked video, you can easily rectify this issue.
If you have any questions or require further assistance, please feel free to reach out.