I saw an error code just like this: "AL 52 -ALARM LIST FULL" how can i reset this one to get back from its original settings

SOURCE: I have a carrier thinline

Hi,
AL-52 = fuse has blown in unit.
You may just need to get fuse replaced or it may of blown fuse due to a more serious issue.

-I would replace it if i was you it is located outside in the condensing unit or get a tech to replace fuse.