Error service unavailable

PHP Code:

$this->db->trans_start();
$this->db->query('AN SQL QUERY...');
$this->db->query('ANOTHER QUERY...');
$this->db->trans_complete();

if ($this->db->trans_status() === FALSE)
{
        // generate an error... or use the log_message() function to log your error
} 


See if the transaction's are giving you the error.

Usually that error means that the web server is unavailable...

OK let me to try it