Index: firmware/App/HDCommon.h
===================================================================
diff -u -r07a39ac5f935a84b2dbb93e3f3d3b3eaa8f37cc4 -re01f7b4be218971dafea65aa21e3ae4d3b4ab610
--- firmware/App/HDCommon.h	(.../HDCommon.h)	(revision 07a39ac5f935a84b2dbb93e3f3d3b3eaa8f37cc4)
+++ firmware/App/HDCommon.h	(.../HDCommon.h)	(revision e01f7b4be218971dafea65aa21e3ae4d3b4ab610)
@@ -25,7 +25,7 @@
 #define HD_VERSION_MAJOR        0
 #define HD_VERSION_MINOR        6
 #define HD_VERSION_MICRO        0
-#define HD_VERSION_BUILD        190
+#define HD_VERSION_BUILD        192
 
 // ********** development build switches **********
 
Index: firmware/App/Modes/ModeTreatment.c
===================================================================
diff -u -r07a39ac5f935a84b2dbb93e3f3d3b3eaa8f37cc4 -re01f7b4be218971dafea65aa21e3ae4d3b4ab610
--- firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision 07a39ac5f935a84b2dbb93e3f3d3b3eaa8f37cc4)
+++ firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision e01f7b4be218971dafea65aa21e3ae4d3b4ab610)
@@ -8,7 +8,7 @@
 * @file    ModeTreatment.c
 *
 * @author  (last)      Sean Nash
-* @date    (last)      17-Jul-2023
+* @date    (last)      19-Jul-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -1135,19 +1135,8 @@
         {
             pendingUFRateChange = 0.0;
         }
-        // Verify treatment duration change would be valid (leave zero if not valid - UI will disable option)
-        if ( ( trtTime <= MAX_TREATMENT_TIME_MINUTES ) && ( trtTime >= getMinTreatmentTimeInMinutes() ) &&
-             ( dialVolume <= MAX_DIALYSATE_VOLUME_ML ) )
-        {
-            result = TRUE;
-            pendingUFVolumeChange = uFVolume;
-            pendingTreatmentTimeChange = trtTime;
-            timeDiff = trtTime - ( (U32)( (F32)presTreatmentTimeSecs / (F32)SEC_PER_MIN ) + 1 );
-        }
-        else
-        {
-            pendingTreatmentTimeChange = 0;
-        }
+        // Treatment duration change is now never valid - leave zero - UI will disable option)
+        pendingTreatmentTimeChange = 0;
         // If neither option works, reject for UF rate
         if ( FALSE == result )
         {
@@ -1209,14 +1198,9 @@
         presMaxUFVolumeML = pendingUFVolumeChange;
         setTreatmentParameterF32( TREATMENT_PARAM_UF_VOLUME, ( presMaxUFVolumeML / (F32)ML_PER_LITER ) );
 
-        // Which setting does user want to adjust to accommodate the UF volume change? (treatment time or UF rate)
-        if ( UF_ADJ_TREATMENT_TIME == adjustment )
+        // User should only allow UF rate adjustment to achieve UF volume change
+        if ( UF_ADJ_UF_RATE == adjustment )
         {
-            presTreatmentTimeSecs = pendingTreatmentTimeChange * SEC_PER_MIN;
-            setTreatmentParameterU32( TREATMENT_PARAM_TREATMENT_DURATION, ( presTreatmentTimeSecs / SEC_PER_MIN ) );
-        }
-        else // Must be adjusting UF rate then
-        {
             sendTreatmentLogEventData( UF_RATE_CHANGE_EVENT, presUFRate, pendingUFRateChange );
             presUFRate = pendingUFRateChange;
             signalInitiatePressureStabilization();
Index: firmware/App/Services/Reservoirs.c
===================================================================
diff -u -r07a39ac5f935a84b2dbb93e3f3d3b3eaa8f37cc4 -re01f7b4be218971dafea65aa21e3ae4d3b4ab610
--- firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision 07a39ac5f935a84b2dbb93e3f3d3b3eaa8f37cc4)
+++ firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision e01f7b4be218971dafea65aa21e3ae4d3b4ab610)
@@ -7,8 +7,8 @@
 *
 * @file    Reservoirs.c
 *
-* @author  (last)      Dara Navaei
-* @date    (last)      12-Jul-2023
+* @author  (last)      Sean Nash
+* @date    (last)      18-Jul-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  21-Nov-2021
@@ -238,20 +238,6 @@
 
 /*********************************************************************//**
  * @brief
- * The setDialysateHeatingParams function is an API to call other internal
- * functions to set the trimmer's heater target temperature and times that are
- * required to calculated the heaters target temperature in DG.
- * @details Inputs: none
- * @details Outputs: none
- * @return none
- *************************************************************************/
-void setDialysateHeatingParams( void )
-{
-    calculateActiveReservoirCycleTime();
-}
-
-/*********************************************************************//**
- * @brief
  * The getLastReservoirUFTimeInMs function returns the reservoir ultrafiltration
  * time (in ms) for the last reservoir used in treatment.
  * @details Inputs: none