Index: firmware/App/Modes/ModeHeatDisinfectActiveCool.c
===================================================================
diff -u -r5109bb981cab2025fcb9de33e303d046085efa18 -r992975fb3cd56ddd7567b5e27f8bebd9b9948e9d
--- firmware/App/Modes/ModeHeatDisinfectActiveCool.c	(.../ModeHeatDisinfectActiveCool.c)	(revision 5109bb981cab2025fcb9de33e303d046085efa18)
+++ firmware/App/Modes/ModeHeatDisinfectActiveCool.c	(.../ModeHeatDisinfectActiveCool.c)	(revision 992975fb3cd56ddd7567b5e27f8bebd9b9948e9d)
@@ -1268,7 +1268,8 @@
         }
 
         // Keep waiting until the TDi temperature is below the target temperature for the specified time
-        if ( TRUE == didTimeout( tempBelowTarget.tempBelowTargetStartTimeMS, RSRVR_ACTIVE_COOL_BELOW_TARGET_TEMP_TIMEOUT_MS ) )
+        if ( ( TRUE == tempBelowTarget.hasTempTargetTimeBeenSet ) &&
+             ( TRUE == didTimeout( tempBelowTarget.tempBelowTargetStartTimeMS, RSRVR_ACTIVE_COOL_BELOW_TARGET_TEMP_TIMEOUT_MS ) ) )
         {
             stateStartTimeMS                         = getMSTimerCount();
             tempBelowTarget.hasTempTargetTimeBeenSet = FALSE;