diff --git a/src/tadoasync/__init__.py b/src/tadoasync/__init__.py
index 9332647..c186bd1 100644
--- a/src/tadoasync/__init__.py
+++ b/src/tadoasync/__init__.py
@@ -5,6 +5,7 @@
     TadoBadRequestError,
     TadoConnectionError,
     TadoError,
+    TadoReadingError,
     TadoServerError,
 )
 from .tadoasync import Tado
@@ -16,4 +17,5 @@
     "TadoAuthenticationError",
     "TadoServerError",
     "TadoBadRequestError",
+    "TadoReadingError",
 ]
diff --git a/src/tadoasync/exceptions.py b/src/tadoasync/exceptions.py
index f42d4ef..6747161 100644
--- a/src/tadoasync/exceptions.py
+++ b/src/tadoasync/exceptions.py
@@ -23,3 +23,7 @@ class TadoBadRequestError(TadoError):
 
 class TadoForbiddenError(TadoError):
     """Tado forbidden exception."""
+
+
+class TadoReadingError(TadoError):
+    """Tado reading exception."""
diff --git a/src/tadoasync/tadoasync.py b/src/tadoasync/tadoasync.py
index 713ac7b..69cdc4d 100644
--- a/src/tadoasync/tadoasync.py
+++ b/src/tadoasync/tadoasync.py
@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import asyncio
-import json
 import time
 from dataclasses import dataclass
 from datetime import datetime, timezone
@@ -41,6 +40,7 @@
     TadoConnectionError,
     TadoError,
     TadoForbiddenError,
+    TadoReadingError,
 )
 from tadoasync.models import (
     Capabilities,
@@ -389,17 +389,19 @@ async def set_child_lock(self, serial_no: str, child_lock: bool | None) -> None:
         )
 
     async def set_meter_readings(
-        self, date: str | None = None, reading: int = 0
-    ) -> str:
+        self, reading: int, date: datetime | None = None
+    ) -> None:
         """Set the meter readings."""
         if date is None:
-            date = datetime.now(timezone.utc).isoformat()
+            date = datetime.now(timezone.utc)
 
-        payload = {"date": date, "reading": reading}
+        payload = {"date": date.strftime("%Y-%m-%d"), "reading": reading}
         response = await self._request(
             endpoint=EIQ_HOST_URL, data=payload, method=HttpMethod.POST
         )
-        return json.dumps(response)
+        data = orjson.loads(response)
+        if "message" in data:
+            raise TadoReadingError(f"Error setting meter reading: {data['message']}")
 
     async def _request(
         self,
diff --git a/tests/__snapshots__/test_tado.ambr b/tests/__snapshots__/test_tado.ambr
index 84ca37c..ae53ae9 100644
--- a/tests/__snapshots__/test_tado.ambr
+++ b/tests/__snapshots__/test_tado.ambr
@@ -1,10 +1,4 @@
 # serializer version: 1
-# name: test_add_meter_readings_duplicated
-  '"{\\n  \\"code\\": \\"duplicated_meter_reading\\",\\n  \\"message\\": \\"reading already exists for date [2024-01-01]\\"\\n}\\n"'
-# ---
-# name: test_add_meter_readings_success
-  '"{\\n  \\"id\\": \\"12345a6b-7c8d-9e01-2fa3-4b5c67890def\\",\\n  \\"homeId\\": 123456,\\n  \\"date\\": \\"2024-01-01\\",\\n  \\"reading\\": 1234\\n}\\n"'
-# ---
 # name: test_geofencing_supported
   dict({
     'presence': 'HOME',
diff --git a/tests/test_tado.py b/tests/test_tado.py
index fed6c5e..f012950 100644
--- a/tests/test_tado.py
+++ b/tests/test_tado.py
@@ -3,6 +3,7 @@
 import asyncio
 import os
 import time
+from datetime import datetime, timezone
 from typing import Any
 from unittest.mock import AsyncMock, MagicMock, patch
 
@@ -18,6 +19,7 @@
     TadoBadRequestError,
     TadoConnectionError,
     TadoError,
+    TadoReadingError,
 )
 
 from syrupy import SnapshotAssertion
@@ -477,14 +479,14 @@ async def test_set_zone_overlay_success(
 
 
 async def test_add_meter_readings_success(
-    python_tado: Tado, responses: aioresponses, snapshot: SnapshotAssertion
+    python_tado: Tado, responses: aioresponses
 ) -> None:
     """Test adding meter readings."""
     responses.post(
         TADO_EIQ_URL,
         body=load_fixture(folder="meter", filename="add_reading_success.json"),
     )
-    assert await python_tado.set_meter_readings(reading=5) == snapshot
+    await python_tado.set_meter_readings(5)
 
 
 async def test_set_child_lock(python_tado: Tado, responses: aioresponses) -> None:
@@ -511,16 +513,21 @@ async def test_set_child_lock(python_tado: Tado, responses: aioresponses) -> Non
 
 
 async def test_add_meter_readings_duplicated(
-    python_tado: Tado, responses: aioresponses, snapshot: SnapshotAssertion
+    python_tado: Tado, responses: aioresponses
 ) -> None:
     """Test adding meter readings with duplicate."""
-    date = "2021-01-01"
+    date = datetime(2023, 10, 1, 12, 0, 0, tzinfo=timezone.utc)
     reading = 5
     responses.post(
         TADO_EIQ_URL,
         body=load_fixture(folder="meter", filename="add_reading_duplicate.json"),
     )
-    assert await python_tado.set_meter_readings(date, reading) == snapshot
+    with pytest.raises(
+        TadoReadingError,
+        match="Error setting meter reading: "
+        "reading already exists for date \\[2024-01-01\\]",
+    ):
+        await python_tado.set_meter_readings(reading, date)
 
 
 async def test_request_client_response_error(python_tado: Tado) -> None: