diff --git a/UpdatePTUDevCtrl/ismas/ismas_client.h b/UpdatePTUDevCtrl/ismas/ismas_client.h
index 1811463..bff1f03 100644
--- a/UpdatePTUDevCtrl/ismas/ismas_client.h
+++ b/UpdatePTUDevCtrl/ismas/ismas_client.h
@@ -145,13 +145,47 @@ public:
         DIRECT_PORT = 7778
     };
 
-
     enum RESULT_CODE {
         SUCCESS=0,
+        // if between 00:00 - 04:00 Wait-button state not WAIT, then we assume
+        // that's an automatic nightly (not-necessary) update
         NO_UPDATE_NECESSARY=1,
-        BACKUP_FAILED=2,
-        WRONG_PACKAGE=3,
-        INSTALL_ERROR=4};
+        // if APISM reports the ISMAS is not available (15x, 6s delay each)
+        ISMAS_NO_CONNECTION_ERROR=2,
+        // if not within 00:00-04:00 and WAIT-button was not in state WAIT
+        ISMAS_TRIGGER_ERROR=3,
+        // cloning git repo. not possible
+        GIT_CLONE_ERROR=4,
+        // pulling from remote git server not possible
+        GIT_PULL_ERROR=5,
+        // fetching from remote git server not possible
+        GIT_FETCH_ERROR=6,
+        // merging fetched data not possible
+        GIT_MERGE_ERROR=7,
+        // check sanity of local customer-repository failed
+        GIT_CHECK_REPOSITORY_ERROR=8,
+        // switch/checkout of branch (i.e. zone) on error
+        GIT_SWITCH_BRANCH_ERROR=9,
+        // fetch/pull of new branch failed. the new branch was not available
+        // when installing via SD-card followed by intial clone during the
+        // update process.
+        GIT_FETCH_NEW_BRANCH_ERROR=10,
+        // error computing git-blob hash-value
+        GIT_HASH_ERROR=11,
+        // update for general json files failed.
+        JSON_FILES_UPDATE_ERROR=12,
+        // error downloading config-json-files to device controller
+        JSON_FILES_DOWNLOAD_ERROR=13,
+        // error downloading device-controller
+        DC_DOWNLOAD_ERROR=14,
+        // error rsyncing json/ini-files to local filesystem
+        RSYN_ERROR=15,
+        // HASH_VALUE_ERROR=14,
+        // HW_COMPATIBILITY_ERROR=15,
+        OPKG_COMMANDS_ERROR=16,
+        // CLEANUP_ERROR=18,
+        UPDATE_IN_ERROR_STATE=99
+    };
 
     enum REASON {
         TIME_TRIGGERED = 0,