diff --git a/homeassistant/components/tuya/binary_sensor.py b/homeassistant/components/tuya/binary_sensor.py
index 91ae00da39f..a2ffe563613 100644
--- a/homeassistant/components/tuya/binary_sensor.py
+++ b/homeassistant/components/tuya/binary_sensor.py
@@ -74,6 +74,14 @@ BINARY_SENSORS: dict[DeviceCategory, tuple[TuyaBinarySensorEntityDescription, ..
         TAMPER_BINARY_SENSOR,
     ),
     DeviceCategory.CS: (
+        TuyaBinarySensorEntityDescription(
+            key=f"{DPCode.FAULT}_water_full",
+            dpcode=DPCode.FAULT,
+            device_class=BinarySensorDeviceClass.PROBLEM,
+            entity_category=EntityCategory.DIAGNOSTIC,
+            bitmap_key="water_full",
+            translation_key="tankfull",
+        ),
         TuyaBinarySensorEntityDescription(
             key="tankfull",
             dpcode=DPCode.FAULT,
diff --git a/tests/components/tuya/snapshots/test_binary_sensor.ambr b/tests/components/tuya/snapshots/test_binary_sensor.ambr
index 5519325b177..2dfccbf14ee 100644
--- a/tests/components/tuya/snapshots/test_binary_sensor.ambr
+++ b/tests/components/tuya/snapshots/test_binary_sensor.ambr
@@ -253,6 +253,57 @@
     'state': 'off',
   })
 # ---
+# name: test_platform_setup_and_discovery[binary_sensor.d825a_i_tank_full-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': None,
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'binary_sensor',
+    'entity_category': <EntityCategory.DIAGNOSTIC: 'diagnostic'>,
+    'entity_id': 'binary_sensor.d825a_i_tank_full',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Tank full',
+    'options': dict({
+    }),
+    'original_device_class': <BinarySensorDeviceClass.PROBLEM: 'problem'>,
+    'original_icon': None,
+    'original_name': 'Tank full',
+    'platform': 'tuya',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'tankfull',
+    'unique_id': 'tuya.giqs1xhsekjelfibscfault_water_full',
+    'unit_of_measurement': None,
+  })
+# ---
+# name: test_platform_setup_and_discovery[binary_sensor.d825a_i_tank_full-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      'device_class': 'problem',
+      'friendly_name': 'D825A I Tank full',
+    }),
+    'context': <ANY>,
+    'entity_id': 'binary_sensor.d825a_i_tank_full',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': 'off',
+  })
+# ---
 # name: test_platform_setup_and_discovery[binary_sensor.dehumidifer_defrost-entry]
   EntityRegistryEntrySnapshot({
     'aliases': list([