Index: firmware/App/Modes/BloodPrime.c
===================================================================
diff -u -r4ddf1777acc4298a9ed034e56b66916256d22c18 -r38355442b06187fe5d57deca647b3adf2fa26b89
--- firmware/App/Modes/BloodPrime.c	(.../BloodPrime.c)	(revision 4ddf1777acc4298a9ed034e56b66916256d22c18)
+++ firmware/App/Modes/BloodPrime.c	(.../BloodPrime.c)	(revision 38355442b06187fe5d57deca647b3adf2fa26b89)
@@ -7,8 +7,8 @@
 *
 * @file    BloodPrime.c
 *
-* @author  (last)      Sean Nash
-* @date    (last)      24-Jan-2023
+* @author  (last)      Michael Garthwaite
+* @date    (last)      15-May-2023
 *
 * @author  (original)  Sean Nash
 * @date    (original)  06-Feb-2021
@@ -36,9 +36,7 @@
 
 // ********** private definitiions ***********
 
-#define TUBING_BLOOD_PRIME_VOLUME_ML                80.0F                   ///< Target blood prime volume to prime the blood side circuit (in mL).
-#define MAX_BLOOD_PRIME_VOLUME_ERROR_ML             60.0F                   ///< Maximum error in total additional blood prime volume (20% of total).
-#define MIN_RAMP_TIME_SEC                           60                      ///< Minimum ramp time for blood prime (in seconds).
+#define MIN_RAMP_TIME_SEC                          60                       ///< Minimum ramp time for blood prime (in seconds).
 
 /// Initial flow rate for blood pump when starting blood prime operation.
 #define BLOOD_PRIME_INIT_BP_FLOW_RATE_ML_MIN       100
@@ -66,7 +64,6 @@
 static OVERRIDE_U32_T bloodPrimePublishInterval = { BLOOD_PRIME_DATA_PUBLISH_INTERVAL, BLOOD_PRIME_DATA_PUBLISH_INTERVAL, BLOOD_PRIME_DATA_PUBLISH_INTERVAL, 0 };
 
 static OVERRIDE_F32_T  cumulativeBloodPrimeVolume_mL = { 0.0, 0.0, 0.0, 0 };    ///< Total cumulative blood prime volume (in mL) from measured blood flow rate.
-static F32 expectedBloodPrimeVolume_mL = 0.0;                                   ///< Total cumulative blood prime volume (in mL) expected based on target blood flow rate.
 
 // ********** private function prototypes **********
 
@@ -92,7 +89,6 @@
     bloodPrimeRampControlTimerCtr = 0;
     bloodPrimePublishTimerCtr = BLOOD_PRIME_DATA_PUBLISH_INTERVAL - 2;  // setup so publish will occur time after next
     cumulativeBloodPrimeVolume_mL.data = 0.0;
-    expectedBloodPrimeVolume_mL = 0.0;
     resetBloodPrimeFlags();
 
     bloodPrimeTargetVolume_mL = (F32)TUBING_BLOOD_PRIME_VOLUME_ML + (F32)getDialyzerBloodVolume();
@@ -143,6 +139,7 @@
     setBloodPumpTargetFlowRate( (U32)bloodPrimeRampFlowRate_mL_min, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
     setDialInPumpTargetFlowRate( DIALYSATE_FLOW_RATE_FOR_RECIRC, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_CLOSED_LOOP );
     cmdStartDGTrimmerHeater();
+    setCurrentSubState( NO_SUB_STATE );
 
     // Start air trap control
     startAirTrapControl();
@@ -226,7 +223,6 @@
 
     // Update blood prime volume delivered so far
     cumulativeBloodPrimeVolume_mL.data += ( getMeasuredBloodFlowRate() * BLOOD_PRIME_FLOW_INTEGRATOR );
-    expectedBloodPrimeVolume_mL        += ( (F32)getTargetBloodFlowRate() * BLOOD_PRIME_FLOW_INTEGRATOR );
 
     // Has blood prime completed?
     if ( getBloodPrimeVolume() >= bloodPrimeTargetVolume_mL )
@@ -237,16 +233,6 @@
         signalBloodPrimeToDialysis();   // Signal treatment mode that it's time to start dialysis
         cmdStopDGTrimmerHeater();       // Stop trimmer heater - dialysis sub-mode will restart as appropriate
     }
-    // Is blood prime taking too long based on set BP rate?
-    else if ( fabs( expectedBloodPrimeVolume_mL - getBloodPrimeVolume() ) > MAX_BLOOD_PRIME_VOLUME_ERROR_ML )
-    {
-#ifndef _RELEASE_
-        if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_PUMP_FLOW_CHECKS ) != SW_CONFIG_ENABLE_VALUE )
-#endif
-        {
-            activateAlarmNoData( ALARM_ID_BLOOD_PRIME_VOLUME_CHECK_FAILURE );
-        }
-    }
     else
     {
         // ramp blood pump on ramp interval