Index: firmware/App/Controllers/Valves.c
===================================================================
diff -u -r8ed20540782ec6b81fc870c33c7a7e6f589a6ff3 -r4d635c390c184a405bdc96e56ce35505fe3868c5
--- firmware/App/Controllers/Valves.c	(.../Valves.c)	(revision 8ed20540782ec6b81fc870c33c7a7e6f589a6ff3)
+++ firmware/App/Controllers/Valves.c	(.../Valves.c)	(revision 4d635c390c184a405bdc96e56ce35505fe3868c5)
@@ -302,15 +302,17 @@
  * @details Inputs: valvesStatus
  * @details Outputs: valvesStatus
  * @param valve that is set to be homed
+ * @param force flag indicating whether homing should be forced even if already homed
+ * @param cartridge flag indicating whether a cartridge may be present requiring a more lax homing
  * @return TRUE if the homing command accepted otherwise, FALSE
  *************************************************************************/
-BOOL homeValve( VALVE_T valve )
+BOOL homeValve( VALVE_T valve, BOOL force, BOOL cartridge )
 {
     BOOL result = FALSE;
 
     if ( valve < NUM_OF_VALVES )
     {   // If haven't already homed the valves, home the valves
-        if ( valvesStatus[ valve ].hasValveBeenHomed != TRUE )
+        if ( ( valvesStatus[ valve ].hasValveBeenHomed != TRUE ) || ( VALVE_FORCE_HOME == force ) )
         {
             valvesStatus[ valve ].hasHomingBeenRequested = TRUE;
         }