The following is usually the case:
- Someone changed the password, to test this try to disarm your alarm from the keypad on the alarm panel. To disarm an armed alarm from the panel you need to enter the password. It that works the problem is not the password.
- Do you have good cellular reception? If you enter the password to fast from your phone/cellular phone sometimes the system do not recognise it. Try putting the password in more slowly.
- Is the telephone number from the phone you use programmed as one of the phone numbers to call when alarm is triggered? It is a security future that only phone numbers programmed into the alarm my call the alarm to control it.