diff --git a/lib/RetailCrm/Exception/LimitException.php b/lib/RetailCrm/Exception/LimitException.php
new file mode 100644
index 0000000..31caf1a
--- /dev/null
+++ b/lib/RetailCrm/Exception/LimitException.php
@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * PHP version 5.4
+ *
+ * Class LimitException
+ *
+ * @category RetailCrm
+ * @package  RetailCrm
+ * @author   RetailCrm <integration@retailcrm.ru>
+ * @license  https://opensource.org/licenses/MIT MIT License
+ * @link     http://www.retailcrm.ru/docs/Developers/ApiVersion5
+ */
+
+namespace RetailCrm\Exception;
+
+/**
+ * PHP version 5.4
+ *
+ * Class LimitException
+ *
+ * @category RetailCrm
+ * @package  RetailCrm
+ * @author   RetailCrm <integration@retailcrm.ru>
+ * @license  https://opensource.org/licenses/MIT MIT License
+ * @link     http://www.retailcrm.ru/docs/Developers/ApiVersion5
+ */
+class LimitException extends \DomainException
+{
+}
diff --git a/lib/RetailCrm/Http/Client.php b/lib/RetailCrm/Http/Client.php
index 419dd00..001f8b0 100755
--- a/lib/RetailCrm/Http/Client.php
+++ b/lib/RetailCrm/Http/Client.php
@@ -16,6 +16,7 @@ namespace RetailCrm\Http;
 
 use RetailCrm\Exception\CurlException;
 use RetailCrm\Exception\InvalidJsonException;
+use RetailCrm\Exception\LimitException;
 use RetailCrm\Response\ApiResponse;
 
 /**
@@ -116,6 +117,11 @@ class Client
 
         $responseBody = curl_exec($curlHandler);
         $statusCode = curl_getinfo($curlHandler, CURLINFO_HTTP_CODE);
+
+        if ($statusCode == 503) {
+            throw new LimitException("Service temporary unavalable");
+        }
+
         $errno = curl_errno($curlHandler);
         $error = curl_error($curlHandler);
 
diff --git a/tests/RetailCrm/Tests/Methods/Version5/ApiClientCustomersTest.php b/tests/RetailCrm/Tests/Methods/Version5/ApiClientCustomersTest.php
index 729fd78..17aea39 100644
--- a/tests/RetailCrm/Tests/Methods/Version5/ApiClientCustomersTest.php
+++ b/tests/RetailCrm/Tests/Methods/Version5/ApiClientCustomersTest.php
@@ -407,7 +407,7 @@ class ApiClientCustomersTest extends TestCase
      */
     public function testCustomersNotesDelete()
     {
-        self::markTestSkipped('Sould be fixed.');
+        self::markTestSkipped('Should be fixed.');
 
         $client = static::getApiClient();
 
diff --git a/tests/RetailCrm/Tests/Methods/Version5/ApiClientDeliveryTest.php b/tests/RetailCrm/Tests/Methods/Version5/ApiClientDeliveryTest.php
index 0ec22cb..032f81f 100644
--- a/tests/RetailCrm/Tests/Methods/Version5/ApiClientDeliveryTest.php
+++ b/tests/RetailCrm/Tests/Methods/Version5/ApiClientDeliveryTest.php
@@ -55,7 +55,7 @@ class ApiClientDeliveryTest extends TestCase
      */
     public function testDeliveryShipments()
     {
-        self::markTestSkipped('Sould be fixed.');
+        self::markTestSkipped('Should be fixed.');
 
         $client = static::getApiClient();