Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -rf1d684e536e7911b356a5d35320c909a1016d3d0 -r8747e947a7bc52dc3a4fb1346935740e08f5e974
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision f1d684e536e7911b356a5d35320c909a1016d3d0)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 8747e947a7bc52dc3a4fb1346935740e08f5e974)
@@ -7,8 +7,8 @@
 *
 * @file    ModeStandby.c
 *
-* @author  (last)      Sean Nash
-* @date    (last)      04-May-2023
+* @author  (last)      Michael Garthwaite
+* @date    (last)      16-May-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -147,6 +147,7 @@
     resetDialInPumpRotorCount();
     resetPreLoadStatus();
     setVenousBubbleDetectionEnabled( FALSE );
+    setCurrentSubState( NO_SUB_STATE );
 
     // Set user alarm recovery actions allowed in this mode
     setAlarmUserActionEnabled( ALARM_USER_ACTION_RESUME, FALSE );
@@ -198,6 +199,15 @@
 
     handleDisinfectCancel( stop );
 
+    // if no active alarms anymore, restore to default valve states for standby mode
+    if ( ( FALSE == doesAlarmStatusIndicateStop() ) && ( VALVE_POSITION_C_CLOSE == getValvePosition( VDI ) ) )
+    {
+        setValvePosition( VDI, VALVE_POSITION_A_INSERT_EJECT );
+        setValvePosition( VDO, VALVE_POSITION_A_INSERT_EJECT );
+        setValvePosition( VBA, VALVE_POSITION_A_INSERT_EJECT );
+        setValvePosition( VBV, VALVE_POSITION_A_INSERT_EJECT );
+    }
+
     // State machine to get DG to prep a reservoir so we can start a treatment
     switch ( currentStandbyState )
     {
@@ -280,8 +290,8 @@
  *************************************************************************/
 BOOL signalUserInitiateTreatment( void )
 {
-    BOOL result = FALSE;
-    DG_VERSIONS_T dgVersion = getDGVersion();
+    BOOL result                            = FALSE;
+    DG_VERSIONS_T dgVersion                = getDGVersion();
     REQUEST_REJECT_REASON_CODE_T rejReason = REQUEST_REJECT_REASON_NONE;
 
     // Verify HD is in standby mode waiting for treatment start request
@@ -309,24 +319,25 @@
     {
         rejReason = REQUEST_REJECT_REASON_BATTERY_IS_NOT_CHARGED;
     }
-#ifdef _RELEASE_
-    else
-#else
+#ifndef _RELEASE_
     else if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_SERVICE_AND_DISINFECT_CHECK ) != SW_CONFIG_ENABLE_VALUE )
 #endif
     {
-        // Verify HD and DG are not over due for service
-        if ( haveHDDGServicesBeenExpired( &rejReason ) != TRUE )
+        if ( getTestConfigStatus( TEST_CONFIG_SKIP_DISINFECT_AND_SERVICE_TX_BLOCKERS ) != TRUE )
         {
-            // Verify DG is disinfected
-            if ( FALSE == isDGDisinfectValid() )
+            // Verify HD and DG are not over due for service
+            if ( haveHDDGServicesBeenExpired( &rejReason ) != TRUE )
             {
-                rejReason = REQUEST_REJECT_REASON_DG_DISINFECT_HAS_BEEN_EXPIRED;
+                // Verify DG is disinfected
+                if ( FALSE == isDGDisinfectValid() )
+                {
+                    rejReason = REQUEST_REJECT_REASON_DG_DISINFECT_HAS_BEEN_EXPIRED;
+                }
+                else if ( getHeatDisinfectTemperatureSensorValue() > MAX_ALLOWED_RO_FILTER_TEMP_FOR_TX_C )
+                {
+                    rejReason = REQUEST_REJECT_REASON_DG_RO_FILTER_TEMPERATURE_OUT_OF_RANGE;
+                }
             }
-            else if ( getHeatDisinfectTemperatureSensorValue() > MAX_ALLOWED_RO_FILTER_TEMP_FOR_TX_C )
-            {
-                rejReason = REQUEST_REJECT_REASON_DG_RO_FILTER_TEMPERATURE_OUT_OF_RANGE;
-            }
         }
     }
 
@@ -354,7 +365,27 @@
  *************************************************************************/
 void signalAlarmActionToStandbyMode( ALARM_ACTION_T action )
 {
-    // Alarm actions not handled in Standby mode
+    switch ( action )
+    {
+        case ALARM_ACTION_STOP:
+            // Pumps should be off
+            signalBloodPumpHardStop();
+            signalDialInPumpHardStop();
+            signalDialOutPumpHardStop();
+            stopSyringePump();
+
+            // Set valves to safe positions
+            setValveAirTrap( STATE_CLOSED );
+            setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
+            setValvePosition( VDO, VALVE_POSITION_C_CLOSE );
+            setValvePosition( VBA, VALVE_POSITION_C_CLOSE );
+            setValvePosition( VBV, VALVE_POSITION_C_CLOSE );
+            break;
+
+        default:
+            // do not handle other actions in standby mode
+            break;
+    }
 }
 
 /*********************************************************************//**