Index: firmware/App/Controllers/ConcentratePumps.c
===================================================================
diff -u -r6abb2df716c69d47f6093d2c34a1f9c89f439528 -r8a5838d191c389dd3646f171c9ad0df3c5cb88a9
--- firmware/App/Controllers/ConcentratePumps.c	(.../ConcentratePumps.c)	(revision 6abb2df716c69d47f6093d2c34a1f9c89f439528)
+++ firmware/App/Controllers/ConcentratePumps.c	(.../ConcentratePumps.c)	(revision 8a5838d191c389dd3646f171c9ad0df3c5cb88a9)
@@ -40,7 +40,8 @@
 
 #define CONCENTRATE_PUMP_SPEED_INCREMENT                    2.0F                                                ///< Speed increase (mL/min) when controlling concentrate pump to target step speed.
 #define CONCENTRATE_PUMP_MIN_SPEED                          3.0F                                                ///< Minimum speed for concentrate pump in mL per min.
-#define CONCENTRATE_PUMP_SPD_OUT_OF_RANGE_TOL_WHEN_ON_PCT   0.02F                                               ///< Concentrate pump speed out of range tolerance when on in percentage.
+#define CONCENTRATE_PUMP_TX_SPD_OUT_OF_RANGE_TOL_PCT        0.02F                                               ///< Concentrate pump treatment speed out of range tolerance when on in percentage.
+#define CONCENTRATE_PUMP_HEAT_DIS_SPD_OUT_OF_RANGE_TOL_PCT  0.05F                                               ///< Concentrate pump heat disinfect speed out of range tolerance when on in percentage.
 #define CONCENTRATE_PUMP_SPD_OUT_OF_RANGE_TOL_WHEN_SLOW_MLPM 1.0F                                               ///< Concentrate pump speed out of range tolerance when slow in mL/min.
 #define CONCENTRATE_PUMP_LOW_SPEED_THRESHOLD_MLPM           10.0F                                               ///< Concentrate pump low speed threshold in mL/min.
 #define CONCENTRATE_PUMP_ZERO_FLOW_RATE                     0xFFFF                                              ///< Pulse width value when zero flow rate or pump is off.
@@ -990,17 +991,19 @@
  *************************************************************************/
 static void monitorPumpSpeed( CONCENTRATE_PUMPS_T pumpId, ALARM_ID_T alarm )
 {
-    F32 cpTargetSpeed = concentratePumps[ pumpId ].currentPumpSpeed;
-    F32 cpError       = fabs( fabs( getMeasuredPumpSpeedMLPM( pumpId ) ) - cpTargetSpeed );
-    BOOL isCpSpeedOut = FALSE;
-    F32 tolerance     = CONCENTRATE_PUMP_SPD_OUT_OF_RANGE_TOL_WHEN_SLOW_MLPM;
+    F32 cpTargetSpeed   = concentratePumps[ pumpId ].currentPumpSpeed;
+    F32 cpError         = fabs( fabs( getMeasuredPumpSpeedMLPM( pumpId ) ) - cpTargetSpeed );
+    BOOL isCpSpeedOut   = FALSE;
+    F32 tolerance       = CONCENTRATE_PUMP_SPD_OUT_OF_RANGE_TOL_WHEN_SLOW_MLPM;
+    DG_OP_MODE_T opMode = getCurrentOperationMode();
 
     if ( cpTargetSpeed > CONCENTRATE_PUMP_LOW_SPEED_THRESHOLD_MLPM )
     {
         // Check if the pump is not in the off state and if it is not and greater than the minimum threshold, divide the error
         // to target speed. If the pump is off the target speed is 0 so the speed check is done differently
+        // The speed tolerance is looser in heat disinfect that the rest of the modes that the concentrate pump are running.
         cpError   = cpError / cpTargetSpeed;
-        tolerance = CONCENTRATE_PUMP_SPD_OUT_OF_RANGE_TOL_WHEN_ON_PCT;
+        tolerance = ( DG_MODE_HEAT == opMode ? CONCENTRATE_PUMP_HEAT_DIS_SPD_OUT_OF_RANGE_TOL_PCT : CONCENTRATE_PUMP_TX_SPD_OUT_OF_RANGE_TOL_PCT );
     }
 
     isCpSpeedOut = ( cpError > tolerance ? TRUE : FALSE );