diff --git a/src/misc/static/media/observatory_off.png b/src/misc/static/media/observatory_off.png
new file mode 100644
index 0000000..69645fd
Binary files /dev/null and b/src/misc/static/media/observatory_off.png differ
diff --git a/src/misc/templates/base.html b/src/misc/templates/base.html
index 9c15cb1..6579799 100644
--- a/src/misc/templates/base.html
+++ b/src/misc/templates/base.html
@@ -246,7 +246,9 @@ a {
                           _img.width = 18;
                           _img.height = 18;
                           _img.id ="obs_state_img";
-                          if (weather_status[0]["sitewatch_global_status"] === "OK")
+                          if (parseInt(weather_status[0]["plc_timeout"]) > parseInt(weather_status[0]["max_plc_timeout"]))
+                              _img.src = "{% static 'media/observatory_off.png' %}";
+                          else if (weather_status[0]["sitewatch_global_status"] === "OK")
                                _img.src = "{% static 'media/observatory.png' %}";
                           else
                               _img.src = "{% static 'media/observatory_red.png' %}";
--
libgit2 0.21.2