Index: firmware/App/Modes/ModeFault.c
===================================================================
diff -u -r200dfbd12ee14a4dbe5ee1daaece7bfce9e8a104 -r830213bc6dcc1a684610caf78c79d55f2cb41e93
--- firmware/App/Modes/ModeFault.c	(.../ModeFault.c)	(revision 200dfbd12ee14a4dbe5ee1daaece7bfce9e8a104)
+++ firmware/App/Modes/ModeFault.c	(.../ModeFault.c)	(revision 830213bc6dcc1a684610caf78c79d55f2cb41e93)
@@ -1,17 +1,17 @@
 /**************************************************************************
 *
-* Copyright (c) 2024-2024 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2024-2026 Diality Inc. - All Rights Reserved.
 *
 * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
 * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
 *
 * @file    ModeFault.c
 *
-* @author  (last)      Vinayakam Mani
-* @date    (last)      05-Aug-2024
+* @author  (last)      Michael Garthwaite
+* @date    (last)      16-Sep-2025
 *
 * @author  (original)  Vinayakam Mani
-* @date    (original)  05-Aug-2024
+* @date    (original)  07-Aug-2024
 *
 ***************************************************************************/
 
@@ -188,20 +188,13 @@
     setValveStateDelayed( D40_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
     setValveStateDelayed( D47_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
     setValveStateDelayed( D3_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
-    setValveStateDelayed( DD_M4_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
 
     // De-energize Balancing chamber and Ultrafiltration valves
     for ( i = FIRST_BC_VALVE; i <= LAST_BC_VALVE; i++ )
     {
         setValveStateDelayed( (DD_VALVES_T)i, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
     }
 
-    // TODO: To be removed once HDD clean up is done
-    for ( i = FIRST_UF_VALVE; i <= FIRST_UF_VALVE; i++ )
-    {
-        setValveStateDelayed( (DD_VALVES_T)i, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
-    }
-
     requestConcentratePumpOff( D11_PUMP, parkPumps );
     requestConcentratePumpOff( D10_PUMP, parkPumps );
     requestConcentratePumpOff( D76_PUMP, parkPumps );
@@ -223,8 +216,6 @@
  *************************************************************************/
 void deenergizeActuatorsWithDrainEnabled( BOOL parkPumps )
 {
-    U32 i;
-
     // Energize drain and spent balancing chamber valves to relieve the pressure.
     setValveState( D53_VALV, VALVE_STATE_OPEN );
     setValveState( D23_VALV, VALVE_STATE_OPEN );
@@ -245,21 +236,13 @@
     setValveStateDelayed( D40_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
     setValveStateDelayed( D47_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
     setValveStateDelayed( D3_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
-    setValveStateDelayed( DD_M4_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
 
     // De-energize portion of balancing chamber valves.
     setValveStateDelayed( D19_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
     setValveStateDelayed( D20_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
     setValveStateDelayed( D21_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
     setValveStateDelayed( D22_VALV, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
 
-    // TODO: To be removed once HDD clean up is done
-    // De-energize Ultrafiltration valves
-    for ( i = FIRST_UF_VALVE; i <= FIRST_UF_VALVE; i++ )
-    {
-        setValveStateDelayed( (DD_VALVES_T)i, VALVE_STATE_CLOSED, DELAY_VALVE_MS );
-    }
-
     requestConcentratePumpOff( D11_PUMP, parkPumps );
     requestConcentratePumpOff( D10_PUMP, parkPumps );
     requestConcentratePumpOff( D76_PUMP, parkPumps );