Index: dialin/common/hd_defs.py
===================================================================
diff -u -r50c8c54ce46c7236d650fb7a2576b0b2b5a8dd5a -rd17138c1fb9f94df0a4bafbc36396841d5c0d299
--- dialin/common/hd_defs.py	(.../hd_defs.py)	(revision 50c8c54ce46c7236d650fb7a2576b0b2b5a8dd5a)
+++ dialin/common/hd_defs.py	(.../hd_defs.py)	(revision d17138c1fb9f94df0a4bafbc36396841d5c0d299)
@@ -292,7 +292,8 @@
     DIALYSIS_START_STATE                                    =  0    # Start state of dialysis sub-mode state machine
     DIALYSIS_UF_STATE                                       =  1    # Ultrafiltration state of the dialysis sub-mode state machine
     DIALYSIS_SALINE_BOLUS_STATE                             =  2    # Saline bolus state of the dialysis sub-mode state machine
-    NUM_OF_DIALYSIS_STATES                                  =  3    # Number of dialysis sub-mode states
+    DIALYSIS_BLOOD_LEAK_ZEROING_STATE                       =  3    # Blood leak zeroing state
+    NUM_OF_DIALYSIS_STATES                                  =  4    # Number of dialysis sub-mode states
 
 @unique
 class TreatmentStopStates(DialinEnum):
@@ -431,3 +432,12 @@
     PW_COMMAND_OPEN                                         = 0
     PW_TIMEOUT_CLOSE                                        = 1
     PW_REJECT_SHOW                                          = 2
+
+@unique
+class BloodLeakZeroingStates(DialinEnum):
+    BLD_ZEROING_IDLE_STATE                                  = 0        # Blood leak zeroing idle state.
+    BLD_ZEROING_FLUSH_STATE                                 = 1        # Blood leak zeroing flush state.
+    BLD_ZEROING_ZERO_STATE                                  = 2        # Blood leak zeroing zero state.
+    BLD_ZEROING_VERIFY_ZEROING_STATE                        = 3        # Blood leak zeroing verify zeroing state.
+    BLD_ZEROING_COMPLETE_STATE                              = 4        # Blood leak zeroing complete state.
+    NUM_OF_BLD_ZEROING_STATES                               = 5        # Number of blood leak zeroing states.