We may have found other answers which could help you.
Click here for Reset Gardtec ChangesDoor chime?
Could anyone help me with gardtec 360/580 anti-code reset?
Gardtec 800 system error code -t after power cut?
Gardtec 300/500 series- key pad shows 1u. ?
change battery on gardtec800?
where can i buy a replacement battery?