Index: firmware/App/Modes/ModeTreatment.c
===================================================================
diff -u -re5d6674fbf4b6ddd8057385babac0a085ce18f42 -red4f6eb9692ea0f5f9cb7acae1cf119932fb2d72
--- firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision e5d6674fbf4b6ddd8057385babac0a085ce18f42)
+++ firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision ed4f6eb9692ea0f5f9cb7acae1cf119932fb2d72)
@@ -1077,7 +1077,7 @@
         pendingParamChangesTimer = getMSTimerCount();
 
         // Verify UF rate change would be valid (leave zero if not valid - UI will disable option)
-        if ( uFRate <= (F32)MAX_UF_RATE_ML_MIN )
+        if ( ( uFRate <= (F32)MAX_UF_RATE_ML_MIN ) && ( uFRate >= MIN_UF_RATE_ML_MIN ) )
         {
             result = TRUE;
             pendingUFVolumeChange = uFVolume;