Index: firmware/App/Modes/OperationModes.c
===================================================================
diff -u -r5f1b50a1d9a7bd6ea17bb666e28ccfeafe56432c -r779dc6a6feba357e509ddff8ad1f1c8d7fc98661
--- firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision 5f1b50a1d9a7bd6ea17bb666e28ccfeafe56432c)
+++ firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision 779dc6a6feba357e509ddff8ad1f1c8d7fc98661)
@@ -215,9 +215,9 @@
 //            currentSubMode = execFlushMode();
 //            break;
 //
-//        case DD_MODE_HEAT:
-//            currentSubMode = execHeatDisinfectMode();
-//            break;
+        case DD_MODE_HEAT:
+            currentSubMode = execHeatDisinfectMode();
+            break;
 //
 //        case DD_MODE_HCOL:
 //            currentSubMode = execHeatDisinfectActiveCoolMode();
@@ -401,9 +401,9 @@
 //            currentSubMode = transitionToFlushMode();
 //            break;
 
-//        case DD_MODE_HEAT:
-//            currentSubMode = transitionToHeatDisinfectMode();
-//            break;
+        case DD_MODE_HEAT:
+            currentSubMode = transitionToHeatDisinfectMode();
+            break;
 
 //        case DD_MODE_HCOL:
 //            currentSubMode = transitionToHeatDisinfectActiveCoolMode();
Index: firmware/App/Services/AlarmMgmtSWFaults.h
===================================================================
diff -u -rff0edadf0c6f161a0a092ddaf94d1940d64f7d5e -r779dc6a6feba357e509ddff8ad1f1c8d7fc98661
--- firmware/App/Services/AlarmMgmtSWFaults.h	(.../AlarmMgmtSWFaults.h)	(revision ff0edadf0c6f161a0a092ddaf94d1940d64f7d5e)
+++ firmware/App/Services/AlarmMgmtSWFaults.h	(.../AlarmMgmtSWFaults.h)	(revision 779dc6a6feba357e509ddff8ad1f1c8d7fc98661)
@@ -169,6 +169,7 @@
     SW_FAULT_ID_NVM_INVALID_RECORD_SELECTED = 138,
     SW_FAULT_ID_NVM_OPS_TIMEOUT = 139,
     SW_FAULT_ID_NVM_INVALID_OPS = 140,
+    SW_FAULT_ID_HEAT_DISINFECT_MODE_INVALID_EXEC_STATE = 141,
     NUM_OF_SW_FAULT_IDS
 } DD_SW_FAULT_ID_T;