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How can I update/change an ADT code?

we rencently moved into a new home that has a ADT alarm system already installed. Is there a way I can change/update the code myself?
TJ, December 2006
Why would you?!

Are you paying for alarm monitoring?

If so... Call them and have them change it for you...

If not... Why would you need a code?!

NewVision, October 2007
Hi, I have also just moved into a new home.
The previous people that lived their have not lived their for a year. They had a tenant in. None of them know the code for the alarm. How can i get this reset. Aparently ADT charge over £100 to do it. Its acost i dont want to pay unless i have to.

Saff, August 2007
Master code + 8 + 02 + new master code + new master code again. This works with most ADT systems. Hope this helps.

Pat, June 2007
there should be a user manual with the system to explain this,

what is the panel /model?

john, January 2007