Index: dialin/common/hd_defs.py
===================================================================
diff -u -r7066faf667d6416689868171a2bdc3ae92929d62 -r5034674f15a54d0adb30c09cd9cb204986fd7f61
--- dialin/common/hd_defs.py	(.../hd_defs.py)	(revision 7066faf667d6416689868171a2bdc3ae92929d62)
+++ dialin/common/hd_defs.py	(.../hd_defs.py)	(revision 5034674f15a54d0adb30c09cd9cb204986fd7f61)
@@ -77,6 +77,21 @@
     POST_STATE_FAILED                                       = 24    # POST self-tests failed state
     NUM_OF_POST_STATES                                      = 25    # Number of initialize & POST mode states
 
+@unique
+class StandbyStates(DialinEnum):
+    STANDBY_START_STATE                                     = 0,    # Start standby (home actuators).
+    STANDBY_WAIT_FOR_TREATMENT_STATE                        = 1     # Wait for treatment.
+    STANDBY_WAIT_FOR_DISINFECT_STATE                        = 2     # Wait for UI to send disinfect option.
+    STANDBY_WAIT_FOR_DG_FLUSH_CMD_RESPONSE_STATE            - 3     # Wait for DG flush command response.
+    STANDBY_WAIT_FOR_DG_FLUSH_TO_START_STATE                = 4     # Wait for DG flush to start.
+    STANDBY_DG_FLUSH_IN_PROGRESS_STATE                      = 5     # DG flush operation is in progress
+    STANDBY_WAIT_FOR_DG_HEAT_DISINFECT_CMD_RESPONSE_STATE   = 6     # Wait for DG heat disinfect command response.
+    STANDBY_WAIT_FOR_DG_HEAT_DISINFECT_TO_START_STATE       = 7     # Wait for DG heat disinfect to start.
+    STANDBY_DG_HEAT_DISINFECT_IN_PROGRESS_STATE             = 8     # DG heat disinfect operation is in progress.
+    STANDBY_WAIT_FOR_DG_CHEM_DISINFECT_CMD_RESPONSE_STATE   = 9     # Wait for DG chemical disinfect command response.
+    STANDBY_WAIT_FOR_DG_CHEM_DISINFECT_TO_START_STATE       = 10    # Wait for DG chemical disinfect to start.
+    STANDBY_DG_CHEM_DISINFECT_IN_PROGRESS_STATE             = 11    # DG chemical disinfect operation is in progress
+    NUM_OF_STANDBY_STATES                                   = 12    # Number of standby states (sub-modes)
 
 @unique
 class PreTreatmentSubModes(DialinEnum):