diff --git a/mecelectronics/integrationpluginmecelectronics.cpp b/mecelectronics/integrationpluginmecelectronics.cpp
index 2078ac35..73bba846 100644
--- a/mecelectronics/integrationpluginmecelectronics.cpp
+++ b/mecelectronics/integrationpluginmecelectronics.cpp
@@ -93,7 +93,13 @@ void IntegrationPluginMecMeter::confirmPairing(ThingPairingInfo *info, const QSt
     connect(reply, &QNetworkReply::finished, info, [=](){
         if (reply->error() != QNetworkReply::NoError) {
             qCWarning(dcMecElectronics()) << "Error connecting to mecmeter:" << reply->error() << reply->errorString();
+            // Device responds with InternalServerError on wrong login
+            if (reply->error() == QNetworkReply::InternalServerError) {
+                info->finish(Thing::ThingErrorAuthenticationFailure, QT_TR_NOOP("The login credentials are not valid."));
+                return;
+            }
             info->finish(Thing::ThingErrorHardwareFailure);
+            return;
         }
 
         pluginStorage()->beginGroup(meterId);
diff --git a/mecelectronics/translations/5853701d-a335-4282-892f-f23670269505-de.ts b/mecelectronics/translations/5853701d-a335-4282-892f-f23670269505-de.ts
index adfd7688..d51202e5 100644
--- a/mecelectronics/translations/5853701d-a335-4282-892f-f23670269505-de.ts
+++ b/mecelectronics/translations/5853701d-a335-4282-892f-f23670269505-de.ts
@@ -8,6 +8,11 @@
         <source>Please enter your login credentials for the mecMeter.</source>
         <translation>Bitte gib Deine Logindaten für das mecMeter ein.</translation>
     </message>
+    <message>
+        <location filename="../integrationpluginmecelectronics.cpp" line="98"/>
+        <source>The login credentials are not valid.</source>
+        <translation>Die eingegebenen Login-Daten sind nicht korrekt.</translation>
+    </message>
 </context>
 <context>
     <name>mecElectronics</name>
diff --git a/mecelectronics/translations/5853701d-a335-4282-892f-f23670269505-en_US.ts b/mecelectronics/translations/5853701d-a335-4282-892f-f23670269505-en_US.ts
index 54680200..532ea10f 100644
--- a/mecelectronics/translations/5853701d-a335-4282-892f-f23670269505-en_US.ts
+++ b/mecelectronics/translations/5853701d-a335-4282-892f-f23670269505-en_US.ts
@@ -8,6 +8,11 @@
         <source>Please enter your login credentials for the mecMeter.</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <location filename="../integrationpluginmecelectronics.cpp" line="98"/>
+        <source>The login credentials are not valid.</source>
+        <translation type="unfinished"></translation>
+    </message>
 </context>
 <context>
     <name>mecElectronics</name>