diff --git a/src/mqtt/qmqtt_client.h b/src/mqtt/qmqtt_client.h
index 95930fb..9ec5941 100644
--- a/src/mqtt/qmqtt_client.h
+++ b/src/mqtt/qmqtt_client.h
@@ -67,16 +67,6 @@ enum ConnectionState
     STATE_CONNECTED,
     STATE_DISCONNECTED
 };
-namespace MqttError {
-    enum MqttError {
-        UnknownError = 0,
-        MqttUnacceptableProtocolVersionError,
-        MqttIdentifierRejectedError,
-        MqttServerUnavailableError,
-        MqttVadUserNameOrPasswordError,
-        MqttNotAuthorizedError
-    };
-}
 
 enum ClientError
 {
@@ -107,7 +97,7 @@ enum ClientError
     MqttUnacceptableProtocolVersionError=1<<16,
     MqttIdentifierRejectedError,
     MqttServerUnavailableError,
-    MqttVadUserNameOrPasswordError,
+    MqttBadUserNameOrPasswordError,
     MqttNotAuthorizedError
 };
 
diff --git a/src/mqtt/qmqtt_client_p.cpp b/src/mqtt/qmqtt_client_p.cpp
index ce55bde..f7d4b76 100644
--- a/src/mqtt/qmqtt_client_p.cpp
+++ b/src/mqtt/qmqtt_client_p.cpp
@@ -39,7 +39,6 @@
 #include <QSslConfiguration>
 #include <QSslKey>
 #endif // QT_NO_SSL
-#include <QDebug>
 
 Q_LOGGING_CATEGORY(client, "qmqtt.client")
 
@@ -176,13 +175,6 @@ void QMQTT::ClientPrivate::initializeErrorHash()
     _socketErrorHash.insert(QAbstractSocket::SslInternalError, SocketSslInternalError);
     _socketErrorHash.insert(QAbstractSocket::SslInvalidUserDataError, SocketSslInvalidUserDataError);
     _socketErrorHash.insert(QAbstractSocket::TemporaryError, SocketTemporaryError);
-
-    _mqttErrorHash.insert(MqttError::MqttUnacceptableProtocolVersionError, MqttUnacceptableProtocolVersionError);
-    _mqttErrorHash.insert(MqttError::MqttIdentifierRejectedError, MqttIdentifierRejectedError);
-    _mqttErrorHash.insert(MqttError::MqttServerUnavailableError, MqttServerUnavailableError);
-    _mqttErrorHash.insert(MqttError::MqttVadUserNameOrPasswordError, MqttVadUserNameOrPasswordError);
-    _mqttErrorHash.insert(MqttError::MqttNotAuthorizedError, MqttNotAuthorizedError);
-
 }
 
 void QMQTT::ClientPrivate::connectToHost()
@@ -437,11 +429,31 @@ void QMQTT::ClientPrivate::onNetworkReceived(const QMQTT::Frame& frm)
 void QMQTT::ClientPrivate::handleConnack(const quint8 ack)
 {
     Q_Q(Client);
-    if (ack==0) {
+
+    switch (ack)
+    {
+    case 0:
         emit q->connected();
+        break;
+    case 1:
+        emit q->error(MqttUnacceptableProtocolVersionError);
+        break;
+    case 2:
+        emit q->error(MqttIdentifierRejectedError);
+        break;
+    case 3:
+        emit q->error(MqttServerUnavailableError);
+        break;
+    case 4:
+        emit q->error(MqttBadUserNameOrPasswordError);
+        break;
+    case 5:
+        emit q->error(MqttNotAuthorizedError);
+        break;
+    default:
+        emit q->error(UnknownError);
+        break;
     }
-   emit q->error(_mqttErrorHash.value(MqttError::MqttError (ack), UnknownError));
-
 }
 
 void QMQTT::ClientPrivate::handlePublish(const Message& message)
diff --git a/src/mqtt/qmqtt_client_p.h b/src/mqtt/qmqtt_client_p.h
index 73df324..a393dd3 100644
--- a/src/mqtt/qmqtt_client_p.h
+++ b/src/mqtt/qmqtt_client_p.h
@@ -89,7 +89,6 @@ class ClientPrivate
     bool _willRetain;
     QByteArray _willMessage;
     QHash<QAbstractSocket::SocketError, ClientError> _socketErrorHash;
-    QHash<MqttError::MqttError, ClientError> _mqttErrorHash;
     QHash<quint16, QString> _midToTopic;
     QHash<quint16, Message> _midToMessage;