If, after starting the home procedure on the machine:

• Home stops immediately
• You may or may not receive a message "Home cancelled due to..." (pause, keyboard, etc). This message only happens in version 1.422.1 and newer.

The issue is that the machine was told to stop homing.

If the message indicated that home was stopped due to pause, the issue is likely with the start stop box:

• The start stop box might be in the wrong mode
• The pause switch may be dusty or damaged

If the message indicated that home was stopped due to the keyboard, check for problems with the keyboard, such as things leaning on it, dirty/damaged switches, etc.

If there was no message, the same issues as above may be the case, however, it will take more effort to track them down.

• Check for a Dusty pause button
• Check the keyboard by cleaning it or replacing it with a similar model.