some one has taken the lid of the end station and the panel is looking for the reset code it may have been changed by the installer but I have given you the default code try it
gts
September 2013
see if it says installer mode if it does key in 99 enter it may say leave engineering if it does press the tick button,it will say checking system then it will be reset,
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home alarm systems.