Index: dialin/common/dg_defs.py
===================================================================
diff -u -r56bed6feb01a0f857cb78d0ba39aacc2e432fff4 -rdbad9b7e15a64dff87ea2be5c359de71b01ffa0f
--- dialin/common/dg_defs.py	(.../dg_defs.py)	(revision 56bed6feb01a0f857cb78d0ba39aacc2e432fff4)
+++ dialin/common/dg_defs.py	(.../dg_defs.py)	(revision dbad9b7e15a64dff87ea2be5c359de71b01ffa0f)
@@ -262,3 +262,7 @@
     NUM_OF_EVENT_DATA_TYPES = 5
 
 
+@unique
+class DGServiceModesStates(DialinEnum):
+    DG_SERVICE_STATE_START      = 0     # Start service mode state
+    NUM_OF_DG_SERVICE_STATES    = 1     # Number of service mode states
\ No newline at end of file
Index: tests/dg_tests.py
===================================================================
diff -u -rd759d3a2a1aed849da9ad9153f268eb9f8b1f6f6 -rdbad9b7e15a64dff87ea2be5c359de71b01ffa0f
--- tests/dg_tests.py	(.../dg_tests.py)	(revision d759d3a2a1aed849da9ad9153f268eb9f8b1f6f6)
+++ tests/dg_tests.py	(.../dg_tests.py)	(revision dbad9b7e15a64dff87ea2be5c359de71b01ffa0f)
@@ -29,7 +29,7 @@
 from dialin.hd.temperatures import HDTemperaturesNames
 from dialin.dg.concentrate_pumps import DGConcentratePumpsStates
 from dialin.dg.uv_reactors import ReactorsNames
-from dialin.common.hd_defs import HDOpModes, HDOpSubModes, PreTreatmentWetSelfTesStates, PostTreatmentStates
+from dialin.common.hd_defs import HDOpModes, HDOpSubModes, PreTreatmentWetSelfTestStates, PostTreatmentStates
 from dialin.hd.post_treatment import HDPostTreatmentDrainStates
 from dialin.common.dg_defs import DGEventList
 from dialin.common.hd_defs import HDEventList
@@ -92,7 +92,7 @@
             .format(HDOpModes(hd.hd_operation_mode).name, hd.hd_operation_sub_mode, hd.alarms.alarm_top,
                     hd.dialysate_outlet_flow.reference_dialysate_outlet_uf_volume,
                     hd.dialysate_outlet_flow.measured_dialysate_outlet_uf_volume,
-                    PreTreatmentWetSelfTesStates(hd.pretreatment.pre_treatment_wet_self_test_state).name,
+                    PreTreatmentWetSelfTestStates(hd.pretreatment.pre_treatment_wet_self_test_state).name,
                     PostTreatmentStates(hd.post_treatment.post_treatment_sub_mode).name,
                     HDPostTreatmentDrainStates(hd.post_treatment.post_treatment_drain_state).name,
                     hd.pretreatment.pre_treatment_prime_state,