Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -r5b71511ab1de37e47a1cde5d33173144fb9bf25f -rbd08e87721d89f77e00a271828f8dff1e10e549b
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 5b71511ab1de37e47a1cde5d33173144fb9bf25f)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision bd08e87721d89f77e00a271828f8dff1e10e549b)
@@ -8,7 +8,7 @@
 * @file    ModeStandby.c
 *
 * @author  (last)      Sean Nash
-* @date    (last)      13-Mar-2023
+* @date    (last)      15-May-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -146,6 +146,7 @@
     resetBloodPumpRotorCount();
     resetDialInPumpRotorCount();
     resetPreLoadStatus();
+    setVenousBubbleDetectionEnabled( FALSE );
 
     // Set user alarm recovery actions allowed in this mode
     setAlarmUserActionEnabled( ALARM_USER_ACTION_RESUME, FALSE );
@@ -197,6 +198,15 @@
 
     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 )
     {
@@ -284,7 +294,7 @@
     REQUEST_REJECT_REASON_CODE_T rejReason = REQUEST_REJECT_REASON_NONE;
 
     // Verify HD is in standby mode waiting for treatment start request
-    if ( ( MODE_STAN != getCurrentOperationMode() ) || ( STANDBY_WAIT_FOR_TREATMENT_STATE != currentStandbyState ) )
+    if ( ( MODE_STAN != getCurrentOperationMode() ) || ( STANDBY_WAIT_FOR_TREATMENT_STATE != currentStandbyState ) || ( isPOSTPassed() != TRUE ) )
     {
         rejReason = REQUEST_REJECT_REASON_NOT_ALLOWED_IN_CURRENT_MODE;
     }
@@ -299,7 +309,7 @@
         rejReason = REQUEST_REJECT_REASON_DG_INCOMPATIBLE;
     }
     // Verify DG is not busy
-    else if ( ( DG_MODE_STAN != getDGOpMode() ) || ( DG_STANDBY_MODE_STATE_IDLE != getDGSubMode() ) )
+    else if ( ( DG_MODE_STAN != getDGOpMode() ) || ( DG_STANDBY_MODE_STATE_IDLE != getDGSubMode() ) ) // || ( isDGPOSTPassed() != TRUE ) )  // TODO - is DG sending status???
     {
         rejReason = REQUEST_REJECT_REASON_DG_NOT_IN_STANDBY_IDLE_STATE;
     }
@@ -353,7 +363,27 @@
  *************************************************************************/
 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;
+    }
 }
 
 /*********************************************************************//**
@@ -669,7 +699,7 @@
             // Home pumps and valves
             for ( valve = VDI; valve < NUM_OF_VALVES; ++valve )
             {
-                homeValve( valve );
+                homeValve( valve, VALVE_NO_FORCE_HOME, VALVE_CARTRIDGE_MAY_BE_PRESENT );
             }
             homeBloodPump();
             homeDialInPump();