Index: firmware/App/Controllers/BalancingChamber.c
===================================================================
diff -u -r2d295ca85f19e95da42476a57ca6b4496baf980a -rc90f3d61bde2a2b47d1048635be4dadf282e2195
--- firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision 2d295ca85f19e95da42476a57ca6b4496baf980a)
+++ firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision c90f3d61bde2a2b47d1048635be4dadf282e2195)
@@ -53,14 +53,14 @@
 #define SPENT_FILL_SLOPE_SPENT_PRESSURE_HIGH_PSIG   2.0F                                        ///< Above this absolute spent pressure, only one rise hit is required.
 #define SPENT_FILL_SLOPE_SPENT_PRESSURE_LOW_PSIG    0.5F                                        ///< Below this absolute spent pressure, use Qd-based required rise hit count.
 #define SPENT_FILL_SLOPE_MAX_RISE_HITS              2                                           ///< Rise hits required when Qd <= 150 in the low spent-pressure band.
-#define SPENT_FILL_DETECT_COUNT_TOL_PCT             0.20F                                       ///< Allowed detection timing tolerance as a fraction of expected BC switching count.
+#define SPENT_FILL_DETECT_COUNT_TOL_PCT             1.0F                                       ///< Allowed detection timing tolerance as a fraction of expected BC switching count.
 #define QD_THRESHOLD_HIGH_MLPM                      400.0F                                      ///< Qd threshold (mL/min) below which mid pressure limit applies.
 #define SPENT_DIFF_COUNT_ZERO                       0                                           ///< Zero count difference for spent side fill comparing target count
 #define D48_SPEED_ADJUST_FACTOR                     0.5F                                        ///< D48 speed adjustment factor ( 50% of speed adjustment = 0.5)
 #define D48_SPEED_RANGE_LIMIT                       0.25F                                       ///< D48 speed adjustment range check limit ( D48 speed can vary +/-25% of initial calculated speed)
 #define BICARB_CHAMBER_PERIODIC_FILL_TIME           ( 1 * SEC_PER_MIN * \
                                                     ( MS_PER_SECOND / TASK_GENERAL_INTERVAL ) ) ///< Periodic bicarb chamber fill request 60 sec x 20 = 1200
-#define BAL_CHAMBER_FILL_TIMEOUT_FACTOR             1.5                                         ///< Balancing Chamber fill timeout factor (150% of observed fill count)
+#define BAL_CHAMBER_FILL_TIMEOUT_FACTOR             2.5                                         ///< Balancing Chamber fill timeout factor (150% of observed fill count)
 
 /// Payload record structure for balancing chamber switch only request
 typedef struct
@@ -701,7 +701,7 @@
 
     // Check both spent and fresh side fill is complete
     isBothFillsComplete = ( TRUE == isSpentFillComplete ) && ( TRUE == isPressureStabilizedDuringFill );
-    isFirstCycleNotDone = ( FALSE == isFirstCycleBCSwitchingCompleted );
+    isFirstCycleNotDone = ( FALSE == isFirstCycleBCSwitchingCompleted ) && ( currentBalChamberSwitchingCounter >= balChamberValveClosePeriod );
 
     if ( FALSE == getBalChamberSwitchingOnlyStatus() )
     {
@@ -949,7 +949,7 @@
 
     // Check switching cycle time or pressure check for valve closure
     isBothFillsComplete = ( TRUE == isSpentFillComplete ) && ( TRUE == isPressureStabilizedDuringFill );
-    isFirstCycleNotDone = ( FALSE == isFirstCycleBCSwitchingCompleted );
+    isFirstCycleNotDone = ( FALSE == isFirstCycleBCSwitchingCompleted ) && ( currentBalChamberSwitchingCounter >= balChamberValveClosePeriod );
 
     if ( FALSE == getBalChamberSwitchingOnlyStatus() )
     {