diff --git a/lib/features/reservation/presentation/widgets/reservation_section_widget.dart b/lib/features/reservation/presentation/widgets/reservation_section_widget.dart
index d8ec4e1..d247407 100644
--- a/lib/features/reservation/presentation/widgets/reservation_section_widget.dart
+++ b/lib/features/reservation/presentation/widgets/reservation_section_widget.dart
@@ -56,10 +56,7 @@ class _ReservationSectionWidgetState
   }
 
   List<int> _floorsFrom(List<MachineModel> machines, int? userFloor) {
-    final floors = machines
-        .map((m) => m.floorNumber)
-        .whereType<int>()
-        .toSet();
+    final floors = machines.map((m) => m.floorNumber).whereType<int>().toSet();
     if (userFloor != null) {
       floors.add(userFloor);
     }
@@ -220,8 +217,9 @@ class _ReservationSectionWidgetState
       data: (data) {
         final typedMachines = _machinesForType(data.machines);
         final floors = _floorsFrom(typedMachines, userFloor);
+        // 해당 타입 기기가 없고 방 번호로 층도 못 읽으면 floors 가 비어 있다.
         final currentFloor =
-            _selectedFloor ?? (floors.isNotEmpty ? floors.first : 0);
+            _selectedFloor ?? userFloor ?? floors.firstOrNull ?? 0;
         final items = _buildItems(
           typedMachines,
           activeReservations,
diff --git a/lib/main.dart b/lib/main.dart
index 1a060b8..c8d71c4 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -4,6 +4,7 @@ import 'package:firebase_core/firebase_core.dart';
 import 'package:firebase_crashlytics/firebase_crashlytics.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_screenutil/flutter_screenutil.dart';
 import 'package:washer/core/env/app_environment.dart';
@@ -18,6 +19,9 @@ void main() async {
   // 서로 독립적인 초기화는 병렬로 처리한다.
   await Future.wait([
     AppEnvironment.initialize(),
+    SystemChrome.setPreferredOrientations([
+      DeviceOrientation.portraitUp, // 세로 방향으로 고정
+    ]),
     Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform),
   ]);
   if (kDebugMode) {
diff --git a/test/features/reservation/reservation_section_floor_test.dart b/test/features/reservation/reservation_section_floor_test.dart
new file mode 100644
index 0000000..1f9373a
--- /dev/null
+++ b/test/features/reservation/reservation_section_floor_test.dart
@@ -0,0 +1,133 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_screenutil/flutter_screenutil.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:washer/core/enums/laundry_machine_type.dart';
+import 'package:washer/features/reservation/data/models/local/active_reservation_model.dart';
+import 'package:washer/features/reservation/data/models/local/laundry_machine_model.dart';
+import 'package:washer/features/reservation/presentation/providers/reservation_status_provider.dart';
+import 'package:washer/features/reservation/presentation/widgets/reservation_section_widget.dart';
+import 'package:washer/features/user/data/models/my_user_model.dart';
+import 'package:washer/features/user/presentation/providers/my_user_provider.dart';
+
+class _FakeMachineStatusNotifier extends MachineStatusNotifier {
+  _FakeMachineStatusNotifier(this.machines);
+
+  final List<MachineModel> machines;
+
+  @override
+  Future<MachineStatusResponse> build() async =>
+      MachineStatusResponse(machines: machines, totalCount: machines.length);
+}
+
+class _FakeActiveReservationNotifier extends ActiveReservationNotifier {
+  @override
+  Future<List<ActiveReservationModel>> build() async => const [];
+
+  @override
+  Future<void> ensureLoaded() async {}
+}
+
+class _FakeMyUserNotifier extends MyUserNotifier {
+  _FakeMyUserNotifier(this.roomNumber);
+
+  final String? roomNumber;
+
+  @override
+  Future<MyUserModel?> build() async => MyUserModel(
+    id: 1,
+    name: '테스트',
+    roomNumber: roomNumber,
+  );
+}
+
+MachineModel _washer(String name) => MachineModel(
+  machineId: name.hashCode,
+  name: name,
+  type: 'WASHER',
+  status: 'AVAILABLE',
+  availability: 'AVAILABLE',
+);
+
+Future<void> _pumpSection(
+  WidgetTester tester, {
+  required List<MachineModel> machines,
+  required String? roomNumber,
+}) async {
+  await tester.pumpWidget(
+    ProviderScope(
+      overrides: [
+        machineStatusProvider.overrideWith(
+          () => _FakeMachineStatusNotifier(machines),
+        ),
+        activeReservationProvider.overrideWith(
+          _FakeActiveReservationNotifier.new,
+        ),
+        myUserProvider.overrideWith(() => _FakeMyUserNotifier(roomNumber)),
+      ],
+      child: ScreenUtilInit(
+        designSize: const Size(412, 917),
+        builder: (_, __) => const MaterialApp(
+          home: Scaffold(
+            body: ReservationSectionWidget(
+              laundryMachineType: LaundryMachineType.washer,
+            ),
+          ),
+        ),
+      ),
+    ),
+  );
+  await tester.pumpAndSettle();
+}
+
+void main() {
+  group('ReservationSectionWidget currentFloor', () {
+    testWidgets('기기 목록이 비어 있고 사용자 층도 없으면 빈 안내를 보여준다', (tester) async {
+      await _pumpSection(tester, machines: const [], roomNumber: null);
+
+      expect(tester.takeException(), isNull);
+      expect(find.text('표시할 기기가 없습니다.'), findsOneWidget);
+    });
+
+    testWidgets('해당 타입 기기가 하나도 없어도(건조기만 존재) 크래시하지 않는다', (tester) async {
+      await _pumpSection(
+        tester,
+        machines: [
+          const MachineModel(
+            machineId: 1,
+            name: 'Dryer-3F-L1',
+            type: 'DRYER',
+            status: 'AVAILABLE',
+            availability: 'AVAILABLE',
+          ),
+        ],
+        roomNumber: null,
+      );
+
+      expect(tester.takeException(), isNull);
+      expect(find.text('표시할 기기가 없습니다.'), findsOneWidget);
+    });
+
+    testWidgets('사용자 층을 못 읽어도 기기가 있으면 가장 낮은 층을 보여준다', (tester) async {
+      await _pumpSection(
+        tester,
+        machines: [_washer('Washer-4F-L1'), _washer('Washer-3F-L1')],
+        roomNumber: null,
+      );
+
+      expect(tester.takeException(), isNull);
+      expect(find.text('Washer-3F-L1'), findsOneWidget);
+    });
+
+    testWidgets('사용자 층이 있으면 그 층이 기본 선택된다', (tester) async {
+      await _pumpSection(
+        tester,
+        machines: [_washer('Washer-3F-L1'), _washer('Washer-4F-L1')],
+        roomNumber: '412',
+      );
+
+      expect(find.text('Washer-4F-L1'), findsOneWidget);
+      expect(find.text('Washer-3F-L1'), findsNothing);
+    });
+  });
+}