From defeb45c9f9bf89deddbacbb752c9ff50720a072 Mon Sep 17 00:00:00 2001
From: dvdinth <43087214+dvdinth@users.noreply.github.com>
Date: Mon, 28 Sep 2026 23:48:26 +0200
Subject: [PATCH] Fix intelliclima fan turn on behaviour (#183187)

---
 homeassistant/components/intelliclima/fan.py |  6 ++---
 tests/components/intelliclima/test_fan.py    | 24 ++++++++++++++++++++
 2 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/homeassistant/components/intelliclima/fan.py b/homeassistant/components/intelliclima/fan.py
index 969d97cbefed..8eb949a21d5c 100644
--- a/homeassistant/components/intelliclima/fan.py
+++ b/homeassistant/components/intelliclima/fan.py
@@ -140,10 +140,10 @@ class IntelliClimaVMCFan(IntelliClimaECOEntity, FanEntity):
         """Set mode and speed.
 
         If percentage is None, it first defaults to the respective property.
-        If that is also None, then percentage defaults to 25 (sleep)
+        If that is None or 0, then percentage defaults to 25 (sleep)
         """
-        percentage = self.percentage if percentage is None else percentage
-        percentage = 25 if percentage is None else percentage
+        if percentage is None:
+            percentage = self.percentage or 25
 
         if preset_mode == "auto":
             # auto is a special case with special mode and speed setting
diff --git a/tests/components/intelliclima/test_fan.py b/tests/components/intelliclima/test_fan.py
index 924aca1f81c3..ac70b94672ec 100644
--- a/tests/components/intelliclima/test_fan.py
+++ b/tests/components/intelliclima/test_fan.py
@@ -4,6 +4,7 @@ from collections.abc import AsyncGenerator
 from unittest.mock import AsyncMock, patch
 
 from pyintelliclima.const import FanMode, FanSpeed
+from pyintelliclima.intelliclima_types import IntelliClimaDevices
 import pytest
 from syrupy.assertion import SnapshotAssertion
 
@@ -196,6 +197,29 @@ async def test_fan_turn_on_defaulting_behavior(
     mock_cloud_interface.ecocomfort.turn_off.assert_not_awaited()
 
 
+async def test_fan_turn_on_when_off_without_percentage(
+    hass: HomeAssistant,
+    mock_cloud_interface: AsyncMock,
+    single_eco_device: IntelliClimaDevices,
+) -> None:
+    """turn_on without percentage on an off fan turns it on at sleep speed."""
+    eco = single_eco_device.ecocomfort2_devices["56789"]
+    eco.mode_set = FanMode.off
+    eco.speed_set = FanSpeed.off
+
+    await hass.services.async_call(
+        FAN_DOMAIN,
+        SERVICE_TURN_ON,
+        {ATTR_ENTITY_ID: FAN_ENTITY_ID},
+        blocking=True,
+    )
+
+    mock_cloud_interface.ecocomfort.set_mode_speed.assert_awaited_once_with(
+        "11223344", FanMode.alternate, FanSpeed.sleep
+    )
+    mock_cloud_interface.ecocomfort.turn_off.assert_not_awaited()
+
+
 async def test_fan_turn_on_defaulting_behavior_auto_preset(
     hass: HomeAssistant,
     mock_cloud_interface: AsyncMock,