diff --git a/caimira/apps/calculator/static/js/form.js b/caimira/apps/calculator/static/js/form.js
index 41536425..1ab36325 100644
--- a/caimira/apps/calculator/static/js/form.js
+++ b/caimira/apps/calculator/static/js/form.js
@@ -315,8 +315,15 @@ function show_sensors_data(url) {
         if (result.length == 0) return; // If the ARVE credentials were not defined, we don't have a valid result.
         DATA_FROM_SENSORS = result;
         result.map(room => {
+          if (room['Details']['Online'] == false) return; // If the sensor is offline, it should not be added to the list.
           $("#sensors").append(`<option id=${room.RoomId} value=${room.RoomId}>Sensor ${room.RoomId}</option>`);
         });
+        if ($('#sensors > option').length == 0) {
+          $('#offline_sensors').show();
+          $('#DIVsensors_data').hide();
+          $('#arve_sensor_yes').prop('disabled', true)
+          return; // All sensors are offline
+        }
         populate_temp_hum_values(result, 0);
         if (url.searchParams.has('sensor_in_use')) {
           $("#sensors").val(url.searchParams.get('sensor_in_use'));
diff --git a/caimira/apps/templates/cern/calculator.form.html.j2 b/caimira/apps/templates/cern/calculator.form.html.j2
index ffc67bd2..7a2f418a 100644
--- a/caimira/apps/templates/cern/calculator.form.html.j2
+++ b/caimira/apps/templates/cern/calculator.form.html.j2
@@ -14,7 +14,8 @@
       <label for="arve_sensor_yes">Yes</label>
     </div>
   </div>
-  <div id="DIVsensors_data" style="display:none">
+  <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"> 
     <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">