DSC PC1555...don't know keypad code

[JPAstor]

I just moved into a house and it has a home security system already installed.The previous owner did not know the keypad code. Is there any way I can reset this code? I have a DSC PC1555 control panel.

[JPAstor]

i have the manual and it seems there is a key sequence i can type to reprogram it? has anyone done this?

[george]

Do you have the installer code and/or master code for the system?

The master code is REQUIRED to reprogram user codes