While you wait for answers, we may have found some information which could help you.
Click here for Middle Alarm Going
Door chime?
Gardtec 800 system error code -t after power cut?
Gardtec 800 with a battery/fuse failure?
How do I reset my gardtec300 alarm ?
change battery on gardtec800?
How do I take Gardtec 580 keypad off wall?