--- a/www-thermferm/index.php	Fri Aug 01 11:45:35 2014 +0200
+++ b/www-thermferm/index.php	Fri Aug 01 14:42:44 2014 +0200
@@ -37,6 +37,8 @@
 if (isset($_POST['mode']) && isset($_POST['UUID'])) {
     send_cmd('UNIT '.$_POST['UUID']);
     send_cmd('MODE '.$_POST['mode']);
+    unset($_POST['UUID']);
+    unset($_POST['mode']);
 }