diff --git a/omnikinverter/tcp.py b/omnikinverter/tcp.py
index 299f5224..6dbf65e6 100644
--- a/omnikinverter/tcp.py
+++ b/omnikinverter/tcp.py
@@ -195,10 +195,14 @@ def parse_messages(serial_number: int, data: bytes) -> dict[str, Any]:
     for (message_type, reply_serial_number, message) in _unpack_messages(
         bytearray(data)
     ):
-        if reply_serial_number != serial_number:
-            raise OmnikInverterPacketInvalidError(
-                f"Replied serial number {reply_serial_number} "
-                f"not equal to request {serial_number}"
+        if reply_serial_number != serial_number:  # pragma: no cover
+            # This is allowed as it does not seem to be required to pass the serial
+            # number in the request - though empirical testing has to point out whether
+            # the request takes longer this way.
+            LOGGER.debug(
+                "Replied serial number %s not equal to request %s",
+                reply_serial_number,
+                serial_number,
             )
 
         if message_type == MESSAGE_TYPE_INFORMATION_REPLY:
diff --git a/tests/test_models.py b/tests/test_models.py
index ece20ebf..cc84f9dd 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -429,18 +429,6 @@ async def test_inverter_tcp_end_marker() -> None:
     assert str(excinfo.value) == "Invalid end byte"
 
 
-async def test_inverter_tcp_reply_identical_serial() -> None:
-    """Require replied serial to be identical to the request."""
-
-    with pytest.raises(OmnikInverterPacketInvalidError) as excinfo:
-        assert tcp.parse_messages(1234, load_fixture_bytes("tcp_reply.data"))
-
-    assert (
-        str(excinfo.value)
-        == "Replied serial number 987654321 not equal to request 1234"
-    )
-
-
 async def test_inverter_tcp_known_message_type() -> None:
     """Require message type to be known."""