diff --git a/homeassistant/components/fritzbox/climate.py b/homeassistant/components/fritzbox/climate.py
index 17accf35819..de9ec200e3e 100644
--- a/homeassistant/components/fritzbox/climate.py
+++ b/homeassistant/components/fritzbox/climate.py
@@ -29,6 +29,7 @@ from .const import (
     ATTR_STATE_HOLIDAY_MODE,
     ATTR_STATE_SUMMER_MODE,
     ATTR_STATE_WINDOW_OPEN,
+    LOGGER,
 )
 from .model import ClimateExtraAttributes
 
@@ -129,6 +130,11 @@ class FritzboxThermostat(FritzBoxDeviceEntity, ClimateEntity):
 
     async def async_set_hvac_mode(self, hvac_mode: HVACMode) -> None:
         """Set new operation mode."""
+        if self.hvac_mode == hvac_mode:
+            LOGGER.debug(
+                "%s is already in requested hvac mode %s", self.name, hvac_mode
+            )
+            return
         if hvac_mode == HVACMode.OFF:
             await self.async_set_temperature(temperature=OFF_REPORT_SET_TEMPERATURE)
         else:
diff --git a/tests/components/fritzbox/test_climate.py b/tests/components/fritzbox/test_climate.py
index 073a67f22c1..54d222c6899 100644
--- a/tests/components/fritzbox/test_climate.py
+++ b/tests/components/fritzbox/test_climate.py
@@ -288,6 +288,7 @@ async def test_set_temperature_mode_off(hass: HomeAssistant, fritz: Mock) -> Non
 async def test_set_temperature_mode_heat(hass: HomeAssistant, fritz: Mock) -> None:
     """Test setting temperature by mode."""
     device = FritzDeviceClimateMock()
+    device.target_temperature = 0.0
     assert await setup_config_entry(
         hass, MOCK_CONFIG[FB_DOMAIN][CONF_DEVICES][0], ENTITY_ID, device, fritz
     )
@@ -321,9 +322,26 @@ async def test_set_hvac_mode_off(hass: HomeAssistant, fritz: Mock) -> None:
     assert device.set_target_temperature.call_args_list == [call(0)]
 
 
+async def test_no_reset_hvac_mode_heat(hass: HomeAssistant, fritz: Mock) -> None:
+    """Test setting hvac mode."""
+    device = FritzDeviceClimateMock()
+    assert await setup_config_entry(
+        hass, MOCK_CONFIG[FB_DOMAIN][CONF_DEVICES][0], ENTITY_ID, device, fritz
+    )
+
+    await hass.services.async_call(
+        DOMAIN,
+        SERVICE_SET_HVAC_MODE,
+        {ATTR_ENTITY_ID: ENTITY_ID, ATTR_HVAC_MODE: HVACMode.HEAT},
+        True,
+    )
+    assert device.set_target_temperature.call_count == 0
+
+
 async def test_set_hvac_mode_heat(hass: HomeAssistant, fritz: Mock) -> None:
     """Test setting hvac mode."""
     device = FritzDeviceClimateMock()
+    device.target_temperature = 0.0
     assert await setup_config_entry(
         hass, MOCK_CONFIG[FB_DOMAIN][CONF_DEVICES][0], ENTITY_ID, device, fritz
     )