Index: firmware/App/Controllers/SubstitutionPump.c
===================================================================
diff -u -r9eae2f683887bededd2240f51ddfc667d8c1d566 -r3b64586791accd0b9e8d8978b40e2509bb86dfbe
--- firmware/App/Controllers/SubstitutionPump.c	(.../SubstitutionPump.c)	(revision 9eae2f683887bededd2240f51ddfc667d8c1d566)
+++ firmware/App/Controllers/SubstitutionPump.c	(.../SubstitutionPump.c)	(revision 3b64586791accd0b9e8d8978b40e2509bb86dfbe)
@@ -8,7 +8,7 @@
 * @file    SubstitutionPump.c
 *
 * @author  (last)      Michael Garthwaite
-* @date    (last)      11-Jun-2026
+* @date    (last)      16-Jun-2026
 *
 * @author  (original)  Michael Garthwaite
 * @date    (original)  01-May-2026
@@ -211,7 +211,10 @@
 
     isRPMOutOfRange = ( rpmDiff > MAX_ALLOWED_ML_OUT_OF_RANGE ? TRUE : FALSE );
 
-    checkPersistentAlarm( ALARM_ID_DD_D92_PUMP_RPM_OUT_OF_RANGE, isRPMOutOfRange, d92SpeedmLmin, MAX_ALLOWED_ML_OUT_OF_RANGE );
+    if ( substitutionPumps[ D92_PUMP ].execState != SUBSTITUTION_PUMP_OFF_STATE )
+    {
+        checkPersistentAlarm( ALARM_ID_DD_D92_PUMP_RPM_OUT_OF_RANGE, isRPMOutOfRange, d92SpeedmLmin, MAX_ALLOWED_ML_OUT_OF_RANGE );
+    }
 }
 
 /*********************************************************************//**