diff --git a/homeassistant/components/roomba/vacuum.py b/homeassistant/components/roomba/vacuum.py
index a608c837d5ca..7731491a4c78 100644
--- a/homeassistant/components/roomba/vacuum.py
+++ b/homeassistant/components/roomba/vacuum.py
@@ -352,6 +352,12 @@ class BraavaJet(IRobotVacuum):
             for spray in BRAAVA_SPRAY_AMOUNT
         ]
 
+        # Combo models report a mop pad but not `rankOverlap`, which the mop
+        # behavior is derived from.
+        if self.vacuum_state.get("rankOverlap") is None:
+            self._attr_supported_features &= ~VacuumEntityFeature.FAN_SPEED
+            self._attr_fan_speed_list = []
+
     @property
     @override
     def fan_speed(self) -> str:
diff --git a/tests/components/roomba/test_vacuum.py b/tests/components/roomba/test_vacuum.py
index 1533ab445927..e9ba408da431 100644
--- a/tests/components/roomba/test_vacuum.py
+++ b/tests/components/roomba/test_vacuum.py
@@ -1,5 +1,6 @@
 """Tests for the Roomba vacuum platform."""
 
+from typing import Any
 from unittest.mock import AsyncMock, patch
 
 import pytest
@@ -9,6 +10,7 @@ from homeassistant.components.vacuum import (
     DOMAIN as VACUUM_DOMAIN,
     SERVICE_SET_FAN_SPEED,
     VacuumActivity,
+    VacuumEntityFeature,
 )
 from homeassistant.const import ATTR_ENTITY_ID, Platform
 from homeassistant.core import HomeAssistant
@@ -68,6 +70,43 @@ async def test_vacuum_activity(
     assert state.state == expected
 
 
+@pytest.mark.parametrize(
+    ("extra_state", "expect_fan_speed_support", "expected_fan_speed"),
+    [
+        # 67 is OVERLAP_STANDARD.
+        ({"rankOverlap": 67}, True, "Standard-1"),
+        # Combo models report a mop pad but no rankOverlap.
+        ({}, False, None),
+    ],
+)
+async def test_braava_fan_speed_requires_rank_overlap(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_roomba: AsyncMock,
+    extra_state: dict[str, Any],
+    expect_fan_speed_support: bool,
+    expected_fan_speed: str | None,
+) -> None:
+    """Test that fan speed is only offered when it can be produced."""
+    reported = mock_roomba.master_state["state"]["reported"]
+    reported["detectedPad"] = "reusableWet"
+    # fan_speed reads the "disposable" key.
+    reported["padWetness"] = {"disposable": 1, "reusable": 1}
+    reported.pop("rankOverlap", None)
+    reported.update(extra_state)
+
+    with patch("homeassistant.components.roomba.PLATFORMS", [Platform.VACUUM]):
+        mock_config_entry.add_to_hass(hass)
+        await hass.config_entries.async_setup(mock_config_entry.entry_id)
+        await hass.async_block_till_done()
+
+    state = hass.states.get(ENTITY_ID)
+    assert state is not None
+    supported = VacuumEntityFeature(state.attributes["supported_features"])
+    assert bool(supported & VacuumEntityFeature.FAN_SPEED) is expect_fan_speed_support
+    assert state.attributes.get("fan_speed") == expected_fan_speed
+
+
 @pytest.mark.parametrize(
     ("fan_speed", "translation_key"),
     [
@@ -89,7 +128,10 @@ async def test_braava_set_fan_speed_invalid(
     translation_key: str,
 ) -> None:
     """Test that invalid Braava fan speeds raise instead of being swallowed."""
-    mock_roomba.master_state["state"]["reported"]["detectedPad"] = "reusableWet"
+    reported = mock_roomba.master_state["state"]["reported"]
+    reported["detectedPad"] = "reusableWet"
+    # 67 is OVERLAP_STANDARD; without it the mop behavior is not offered at all.
+    reported["rankOverlap"] = 67
 
     await _setup(hass, mock_config_entry)