how can i fix my altex house alarm?

You not tell us the model (eurosec etc)

But even if we knew we couldn't tell you the procedure for a lost code on this open site,

Maybe you should speak to Altex and book a service visit.

Sorry :(

Altex Security Installations
29 Stowe Close
Liverpool, L25 7YE
Phone: 0151-448 1717

e manno
April 2013