Index: firmware/App/Services/TxParams.c
===================================================================
diff -u -r52787cd53986cfd0abb7e674bf096898e5070f9a -r332b21aa10060e7cec0284b9851ff1d86813a2b4
--- firmware/App/Services/TxParams.c	(.../TxParams.c)	(revision 52787cd53986cfd0abb7e674bf096898e5070f9a)
+++ firmware/App/Services/TxParams.c	(.../TxParams.c)	(revision 332b21aa10060e7cec0284b9851ff1d86813a2b4)
@@ -941,6 +941,7 @@
 static REQUEST_REJECT_REASON_CODE_T validateIsolatedUFDuration( U32 durationMin )
 {
     REQUEST_REJECT_REASON_CODE_T reason = REQUEST_REJECT_REASON_NONE;
+    TREATMENT_STATE_T treatmentState = getTreatmentState();
     U32 prescribedDurationMin = getTreatmentParameterU32( TREATMENT_PARAM_TREATMENT_DURATION );
     U32 maxTreatmentDurationMin = getU32TreatmentParamUpperRangeLimit( TREATMENT_PARAM_TREATMENT_DURATION );
     U32 cumulativeIsoUFTimeMin = getCumulativeIsolatedUFTimeMin();
@@ -950,7 +951,7 @@
     {
         reason = REQUEST_REJECT_REASON_NOT_IN_TREATMENT_MODE;
     }
-    else if ( ( TREATMENT_DIALYSIS_STATE != getTreatmentState() ) &&
+    else if ( ( TREATMENT_DIALYSIS_STATE != treatmentState ) && ( TREATMENT_ISO_UF_STATE != treatmentState ) &&
               ( FALSE == isPostTreatmentIsolatedUFRequest() ) )
     {
         reason = REQUEST_REJECT_REASON_INVALID_TREATMENT_STATE;
@@ -1163,7 +1164,11 @@
 
                     if ( TRUE == activeUpdated )
                     {
-                        signalStartIsolatedUF( ( TRUE == isPostTreatmentIsolatedUFRequest() ? FALSE : TRUE ) );
+                        if ( TREATMENT_ISO_UF_STATE != getTreatmentState() )
+                        {
+                            signalStartIsolatedUF( ( TRUE == isPostTreatmentIsolatedUFRequest() ? FALSE : TRUE ) );
+                        }
+
                         accepted = TRUE;
                         resetIsolatedUFSettingsPending();
                     }
@@ -1193,7 +1198,7 @@
     }
 
     response.mAccepted = (U32)accepted;
-    response.mReason   = (U32)reason;
+    response.mReason = (U32)reason;
     sendMessage( MSG_ID_TD_ISOLATED_UF_CONFIRM_RESPONSE, COMM_BUFFER_OUT_CAN_TD_2_UI, (U08*)(&response), sizeof( ISOLATED_UF_CONFIRM_RESPONSE_PAYLOAD_T ) );
 
     return accepted;