TAMPER LIGHT SHOWING ON RKP?

HI
I HAVE JUST FITTED A NEW TEXECOM R8 PLUS WITH LCD RKP.
BELL BOX IS A GARDTEC XS3D
I HAVE WIRED FOR A GARDTECH NOVA GARD 2 AS IN THE TEXE MANUAL.
A-RED- SUPPLY +
B - BLUE - BELL SW-
C - YELLOW - R TAMP RET
D - BLK - SUPPLY -
S - GREEN - STROBE -


SOUNDER WORKING OK
STOBE OK
LED'S OK

BUT TAMPER LIGHT ON KEYPAD SO CANT SET ALARM

DIDNT BOTHER WITH TAMPERS ON PIR'S BUT LINK IN PANEL FOR THIS SO ISN'T A COMPONANT TAMP PROBLEM.
CAN ANYBODY THROW ANY LIGHT ON MY PROBLEM ?
I SUSPECT ITS TO DO WITH TAMPER RET ON BELL BOX