Guider relay control allows to move the telescope by sending pulse to the telescopic mount during a given duration in seconds.

Guider relay buttons are enabled only when the guider camera is exposing. 

Do not use the guider relay while imaging because moving the telescopic mount will blur the image.

Guider relay is a very good mean to test if the auto-guiding is working well after the calibration by creating intentional tracking errors in various directions. Take care to adjust the duration to avoid moving beyond the tracking window.
If the mount has moved, looking at the guider frames, but SkyGuard did not register any motion this is a strong indication of a hot pixel issue.

Check the median filter setting, be sure it is at least set to 2x2. Also if the camera exhibits a strong fixed pattern noise dark frame substitution should be consider.