Index: firmware/App/Modes/ModeHeatDisinfect.c
===================================================================
diff -u -r68b2e13b6cd3e91c6ef91e2d47c0613cb2ab96ef -r2315fd382b764d7bb7de5c208d67aa86f8a1a687
--- firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision 68b2e13b6cd3e91c6ef91e2d47c0613cb2ab96ef)
+++ firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision 2315fd382b764d7bb7de5c208d67aa86f8a1a687)
@@ -1961,6 +1961,22 @@
 
     // Check if the temperature gradient in between the coldest and the hottest spot is more than the specified temperature and
     // the timer has not started yet, start it
+    bool gradientOutOfRange = ( fabs( TPoTemp - ThdTemp ) > HEAT_DISINFECT_MAX_TEMP_GRADIENT_C ) ? TRUE : FALSE;
+    if ( !gradientOutOfRange  )
+    {
+        tempGradOutOfRangeTimer = 0;
+    }
+    else if ( 0 == tempGradOutOfRangeTimer )
+    {
+        tempGradOutOfRangeTimer = getMSTimerCount());
+    }
+    else if ( TRUE == didTimeout( tempGradOutOfRangeTimer, HEAT_DISINFECT_TEMP_GRAD_OUT_RANGE_TIME_MS ) )
+    {
+        alarmDetectedPendingTrigger = ALARM_ID_DG_HEAT_DISINFECT_TEMP_GRAD_OUT_OF_RANAGE;
+        status                      = HEAT_DISINFECT_TEMP_GRADIENT_OUT_OF_RANGE;
+    }
+
+/*
     if ( ( fabs( TPoTemp - ThdTemp ) > HEAT_DISINFECT_MAX_TEMP_GRADIENT_C ) && ( 0 == tempGradOutOfRangeTimer ) )
     {
         tempGradOutOfRangeTimer = getMSTimerCount();
@@ -1971,7 +1987,7 @@
         alarmDetectedPendingTrigger = ALARM_ID_DG_HEAT_DISINFECT_TEMP_GRAD_OUT_OF_RANAGE;
         status                      = HEAT_DISINFECT_TEMP_GRADIENT_OUT_OF_RANGE;
     }
-
+*/
     // Check if either reservoir 1 or reservoir 2 are losing volume more than allowed volume
     if ( ( TRUE == isR1OutOfRange ) || ( TRUE == isR2OutOfRange ) )
     {