We may have found other answers which could help you.
Click here for Entering Code Zone
Stuck button on gardtec 500?
How do I take Gardtec 580 keypad off wall?
change battery on gardtec800?
Gardtec 300/500 series- key pad shows 1u. ?
Gardtec cpx lost chime yet again?
Gardtec 800 system error code -t after power cut?