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Basic formatting applied. Unnecessary comments have been removed. Suspicious code is covered by TODO.

Hcs.Client/ClientApi/HcsRemoteException.cs

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+using System;
+using System.Linq;
+
+namespace Hcs.ClientApi
+{
+    /// <summary>
+    /// Сообщение об ошибке возникшей на удаленном сервере ГИС ЖКХ
+    /// </summary>
+    public class HcsRemoteException : HcsException
+    {
+        public string ErrorCode { get; private set; }
+        public string Description { get; private set; }
+
+        public class KnownCodes
+        {
+            public const string НетОбъектовДляЭкспорта = "INT002012";
+            public const string ОтсутствуетВРеестре = "INT002000";
+            public const string ДоступЗапрещен = "AUT011003";
+        }
+
+        public HcsRemoteException(string errorCode, string description)
+            : base(MakeMessage(errorCode, description))
+        {
+            this.ErrorCode = errorCode;
+            this.Description = description;
+        }
+
+        public HcsRemoteException(string errorCode, string description, Exception nestedException)
+            : base(MakeMessage(errorCode, description), nestedException)
+        {
+            this.ErrorCode = errorCode;
+            this.Description = description;
+        }
+
+        private static string MakeMessage(string errorCode, string description)
+            => $"Удаленная система вернула ошибку: [{errorCode}] {description}";
+
+        public static HcsRemoteException CreateNew(string errorCode, string description, Exception nested = null)
+        {
+            if (string.Compare(errorCode, KnownCodes.НетОбъектовДляЭкспорта) == 0)
+                return new HcsNoResultsRemoteException(errorCode, description, nested);
+            return new HcsRemoteException(errorCode, description);
+        }
+
+        public static HcsRemoteException CreateNew(HcsRemoteException nested)
+        {
+            if (nested == null) throw new ArgumentNullException("nested exception");
+            return CreateNew(nested.ErrorCode, nested.Description, nested);
+        }
+
+        /// <summary>
+        /// Возвращает true если ошибка @e или ее вложенные ошибки модержат @errorCode
+        /// </summary>
+        public static bool ContainsErrorCode(Exception e, string errorCode)
+        {
+            if (e == null) return false;
+            return HcsUtil.EnumerateInnerExceptions(e).OfType<HcsRemoteException>().Where(x => x.ErrorCode == errorCode).Any();
+        }
+    }
+}