Index: DDDefs.h
===================================================================
diff -u -r5a84d69bf6a123f083528cb2aec6c509b6566485 -rd99f22c6c8c038791214fad1baa6a48840116edf
--- DDDefs.h	(.../DDDefs.h)	(revision 5a84d69bf6a123f083528cb2aec6c509b6566485)
+++ DDDefs.h	(.../DDDefs.h)	(revision d99f22c6c8c038791214fad1baa6a48840116edf)
@@ -241,7 +241,20 @@
 /// Enumeration of heat disinfect mode states.
 enum DD_Heat_States
 {
-    DD_HEAT_DISINFECT_STATE_START = 0,                          ///< Heat disinfect, start mode state
+    DD_HEAT_DISINFECT_STATE_START = 0,                          ///< Skip hydraulic chamber recirc; enter depressurize
+    DD_HEAT_DISINFECT_DEPRESSURIZE_BICART,                      ///< Wait for D6 full, then depressurize bicart
+    DD_HEAT_DISINFECT_DD_RECIRC_SETUP,                          ///< Transient DD recirc setup; 2 min stability then open loop
+    DD_HEAT_DISINFECT_PRESSURE_CHECK,                           ///< Wait for D18 > 3 PSI before starting D5
+    DD_HEAT_DISINFECT_DD_RECIRC_MAIN,                           ///< Main recirc path, 5 s
+    DD_HEAT_DISINFECT_DD_RECIRC_DIALYZER,                       ///< Dialyzer line recirc, 5 s
+    DD_HEAT_DISINFECT_DD_RECIRC_D100,                           ///< D100 line recirc, 5 s
+    DD_HEAT_DISINFECT_DD_RECIRC_D34,                            ///< D34 line recirc, 5 s
+    DD_HEAT_DISINFECT_DD_RECIRC_D91,                            ///< D91 line recirc, 5 s
+    DD_HEAT_DISINFECT_DD_RECIRC_D76_D47,                        ///< D76 and D47 line recirc, 10 s
+    DD_HEAT_DISINFECT_HYDROBLOCK_RECIRC,                        ///< WCID hydroblock recirc / reheat
+    DD_HEAT_DISINFECT_BICART_SUPPLY,                            ///< WCID bicart supply recirc, 6 s
+    DD_HEAT_DISINFECT_BICART_VENT,                              ///< WCID bicart vent recirc, 6 s
+    DD_HEAT_DISINFECT_WCID_DWELL_CHECK,                         ///< D5 off, mix, then D4 dwell check
     DD_HEAT_DISINFECT_STATE_COMPLETE,                           ///< Heat disinfect, complete state
     NUM_OF_DD_HEAT_DISINFECT_STATES                             ///< Number of heat disinfect mode states
 };
Index: MsgDefs.h
===================================================================
diff -u -r0d4e3836373a771ab8ca90b177b6afcc2e62093f -rd99f22c6c8c038791214fad1baa6a48840116edf
--- MsgDefs.h	(.../MsgDefs.h)	(revision 0d4e3836373a771ab8ca90b177b6afcc2e62093f)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision d99f22c6c8c038791214fad1baa6a48840116edf)
@@ -478,6 +478,7 @@
     MSG_ID_DD_BICART_DEPRESSURISE_REQUEST_OVERRIDE_REQUEST = 0xA074,                    ///< DD dry bicart depressurise overrride request
     MSG_ID_DD_TREATMENT_PARAMS_OVERRIDE_REQUEST = 0xA075,                               ///< DD Treatment parameters override request
     MSG_ID_DD_NVM_RECORD_CRC_OVERRIDE_REQUEST  = 0xA076,                                ///< DD NVM Record CRC override Request
+    MSG_ID_DD_HEAT_DISINFECT_STATE_DATA = 0xA077,					///< DD Heat Disinfection state data
 
     MSG_ID_FIRST_FP_TESTER_MESSAGE = 0xB000,                                            ///< First FP test message ID
     MSG_ID_FP_TESTER_LOGIN_REQUEST = MSG_ID_FIRST_FP_TESTER_MESSAGE,                    ///< FP tester log-in