Index: dialin/ui/hd_simulator.py
===================================================================
diff -u -r85ac5647d7df354bf6b7ca1a354bcf7a62735d02 -rd9693d0e5f7208e6915420d11a8fa261ae3290fb
--- dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision 85ac5647d7df354bf6b7ca1a354bcf7a62735d02)
+++ dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision d9693d0e5f7208e6915420d11a8fa261ae3290fb)
@@ -382,6 +382,7 @@
                                                              cumulative=0.0, delivered=0.0)
                     self.salineVolume_ml = 0.0
                     self.salineVolCum_ml = 0.0
+                    self.cmd_send_hd_operation_mode(HDOpModes.MODE_PRET.value,0)
                     rsp_id = MsgIds.MSG_ID_PRE_TREATMENT_STATE_DATA
                     rsp_payload = struct.pack(
                         "<" + str(PreTreatmentSubModes.NUM_OF_HD_PRE_TREATMENT_STATES.value + 1) + "i",