diff --git a/caimira/apps/calculator/static/js/form.js b/caimira/apps/calculator/static/js/form.js
index cfd23c64..45656c78 100644
--- a/caimira/apps/calculator/static/js/form.js
+++ b/caimira/apps/calculator/static/js/form.js
@@ -332,8 +332,9 @@ function show_sensors_data(url) {
         }
       },
       error: function(_, _, errorThrown) {
-        if (errorThrown != 'Unauthorized') alert(errorThrown);
-        else alert('Unauthorized - Something went wrong during the ARVE API authentication process.');
+        $("#arve_api_error_message").val(errorThrown).show();
+        $('#DIVsensors_data').hide();
+        $('#arve_sensor_yes').prop('disabled', true)
       }
     });
   }
diff --git a/caimira/apps/templates/cern/calculator.form.html.j2 b/caimira/apps/templates/cern/calculator.form.html.j2
index 7a2f418a..4e5ae90a 100644
--- a/caimira/apps/templates/cern/calculator.form.html.j2
+++ b/caimira/apps/templates/cern/calculator.form.html.j2
@@ -15,7 +15,8 @@
     </div>
   </div>
   <p id="offline_sensors" class="red_text mb-2" style="display: none">All sensors are offline.</p>
-  <div id="DIVsensors_data" class="mb-1" style="display:none"> 
+  <p id="arve_api_error_message" class="red_text mb-2" style="display:none; max-width: 85%;">Unauthorized - Something went wrong during the ARVE API authentication process.</p> 
+  <div id="DIVsensors_data" class="mb-1" style="display:none">
     <div class="form-group row mb-0">
       <div class="col-sm-4"><label class="col-form-label">Sensor:</label></div>
       <div class="col-sm-6">