Head come down to start cut fires but will not move up, then throws a error code
line 10
G38.2 Z-5. F100. any help we be much appreciate
This is not a THC issue. That line is the first part of the IHS cycle and it tells the Z axis to go down(up to 5 inches) until the IHS switch opens. The error at that line indicates that the IHS switch is not opening.
Your comment that the torch fires does not make sense. The torch fire command is several lines after the line that causes the error, so it should not fire the torch