diff --git a/CHANGELOG.md b/CHANGELOG.md
index f14f9a0..cbb514e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,13 @@
+## [0.4.7] - 2026-04-27
+
+* Added `isMaintenanceError` getter on `ErrorResult?` extension - returns `true`
+  for `GlobalErrorCode.maintenanceError`.
+* `isTemporaryServerError` now also returns `true` for maintenance errors -
+  maintenance is treated as a temporary server state.
+* `HttpStatus.badGateway` (502) is no longer included in
+  `isTemporaryServerError`. It was a fallback for maintenance handling; with
+  an explicit `maintenanceError` code, 502 should be reported separately.
+
 ## [0.4.6] - 2026-04-02
 
 * Added `maintenanceError` and `serviceDownError` error codes to `GlobalErrorCode`.
diff --git a/lib/src/error_result_extension.dart b/lib/src/error_result_extension.dart
index 5a7749a..ad067eb 100644
--- a/lib/src/error_result_extension.dart
+++ b/lib/src/error_result_extension.dart
@@ -23,6 +23,12 @@ extension CommonErrorResultExtensionErrorCode on ErrorResult? {
   bool get isExternalServiceError =>
       toError()?.isGlobalError(GlobalErrorCode.externalServiceError) ?? false;
 
+  /// Определяет, является ли ошибка сообщением о режиме обслуживания.
+  ///
+  /// См. [GlobalErrorCode.maintenanceError].
+  bool get isMaintenanceError =>
+      toError()?.isGlobalError(GlobalErrorCode.maintenanceError) ?? false;
+
   /// Определяет, является ли текущий результат ошибкой сокет соединения.
   bool get isSocketConnectionFailed =>
       toError()?.isNetworkError(NetworkErrorCode.socketConnectionFailed) ??
@@ -65,19 +71,22 @@ extension CommonErrorResultExtensionErrorCode on ErrorResult? {
 
 /// Расширения [ErrorResult] для работы с кодами общих ошибок.
 extension InternalErrorCodeExtensionErrorResult on ErrorResult {
-  static List<int> get _temporaryServerStatuses => [
-        HttpStatus.badGateway,
+  static const _temporaryServerStatuses = {
         HttpStatus.serviceUnavailable,
         HttpStatus.gatewayTimeout,
-      ];
+      };
 
   /// Определяет, является ли текущий результат ошибкой взаимодействия с внешними сервисами.
   bool get isEmptyDataError => isInternalError(InternalErrorCode.emptyData);
 
   /// Определяет, является ли текущий результат временной ошибкой сервера.
+  ///
+  /// Включает в себя режим обслуживания (см. [isMaintenanceError]) - он
+  /// также считается временным состоянием сервера.
   bool get isTemporaryServerError =>
-      toError()?.isInternalError(InternalErrorCode.temporaryServerError) ??
-      _temporaryServerStatuses.contains(toDioError()?.response?.statusCode);
+      isMaintenanceError ||
+      (toError()?.isInternalError(InternalErrorCode.temporaryServerError) ??
+          _temporaryServerStatuses.contains(toDioError()?.response?.statusCode));
 
   /// Определяет, соответствует ли ошибка указанному коду [InternalErrorCode] если указан.
   bool isInternalError([int? code]) =>
diff --git a/pubspec.yaml b/pubspec.yaml
index ef290a6..d99570a 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: innim_remote_error
 description: Remote error object and common codes for Innim projects. Using Dio.
-version: 0.4.6
+version: 0.4.7
 homepage: https://github.com/innim/
 repository: https://github.com/Innim/flutter_remote_error
 issue_tracker: https://github.com/Innim/flutter_remote_error/issues
diff --git a/test/error_result_extension_test.dart b/test/error_result_extension_test.dart
index c68f8e0..2995ecf 100644
--- a/test/error_result_extension_test.dart
+++ b/test/error_result_extension_test.dart
@@ -1,3 +1,5 @@
+import 'dart:io';
+
 import 'package:dio/dio.dart';
 import 'package:innim_remote_error/innim_remote_error.dart';
 import 'package:test/test.dart';
@@ -85,6 +87,47 @@ void main() {
       });
     });
 
+    group('isMaintenanceError', () {
+      test('should return true for GlobalErrorCode.maintenanceError', () {
+        final res = _remoteError(
+          GlobalErrorCode.domain,
+          GlobalErrorCode.maintenanceError,
+        );
+
+        expect(res.isMaintenanceError, isTrue);
+      });
+
+      test('should return false for other GlobalErrorCode code', () {
+        final res = _remoteError(
+          GlobalErrorCode.domain,
+          GlobalErrorCode.notFound,
+        );
+
+        expect(res.isMaintenanceError, isFalse);
+      });
+
+      test('should return false for non-matching domain', () {
+        final res = _remoteError(
+          'other_domain',
+          GlobalErrorCode.maintenanceError,
+        );
+
+        expect(res.isMaintenanceError, isFalse);
+      });
+
+      test('should return false when no RemoteError', () {
+        final res = _dioError(statusCode: 500);
+
+        expect(res.isMaintenanceError, isFalse);
+      });
+
+      test('should return false when called on null', () {
+        const ErrorResult? res = null;
+
+        expect(res.isMaintenanceError, isFalse);
+      });
+    });
+
     group('isSocketConnectionFailed', () {
       test('should return true for NetworkErrorCode.socketConnectionFailed',
           () {
@@ -411,6 +454,58 @@ void main() {
     });
   });
 
+  group('InternalErrorCodeExtensionErrorResult', () {
+    group('isTemporaryServerError', () {
+      test('should return true for InternalErrorCode.temporaryServerError', () {
+        final res = _remoteError(
+          InternalErrorCode.domain,
+          InternalErrorCode.temporaryServerError,
+        );
+
+        expect(res.isTemporaryServerError, isTrue);
+      });
+
+      test('should return true for GlobalErrorCode.maintenanceError', () {
+        final res = _remoteError(
+          GlobalErrorCode.domain,
+          GlobalErrorCode.maintenanceError,
+        );
+
+        expect(res.isTemporaryServerError, isTrue);
+      });
+
+      test('should return true if http status is 503', () {
+        final res = _dioError(statusCode: HttpStatus.serviceUnavailable);
+
+        expect(res.isTemporaryServerError, isTrue);
+      });
+
+      test('should return true if http status is 504', () {
+        final res = _dioError(statusCode: HttpStatus.gatewayTimeout);
+
+        expect(res.isTemporaryServerError, isTrue);
+      });
+
+      test('should return false if http status is 502', () {
+        final res = _dioError(statusCode: HttpStatus.badGateway);
+
+        expect(res.isTemporaryServerError, isFalse);
+      });
+
+      test('should return false if http status is 500', () {
+        final res = _dioError(statusCode: HttpStatus.internalServerError);
+
+        expect(res.isTemporaryServerError, isFalse);
+      });
+
+      test('should return false for other RemoteError', () {
+        final res = _remoteError('other', 1);
+
+        expect(res.isTemporaryServerError, isFalse);
+      });
+    });
+  });
+
   group('toError()', () {
     test('should return RemoteError when error is RemoteError', () {
       const remoteError = RemoteError('test_domain', 123);