diff --git a/homeassistant/components/overkiz/climate_entities/hitachi_air_to_air_heat_pump_ovp.py b/homeassistant/components/overkiz/climate_entities/hitachi_air_to_air_heat_pump_ovp.py
index b4d6ab788a1..b31ecf91ec0 100644
--- a/homeassistant/components/overkiz/climate_entities/hitachi_air_to_air_heat_pump_ovp.py
+++ b/homeassistant/components/overkiz/climate_entities/hitachi_air_to_air_heat_pump_ovp.py
@@ -298,6 +298,11 @@ class HitachiAirToAirHeatPumpOVP(OverkizEntity, ClimateEntity):
             OverkizState.OVP_FAN_SPEED,
             OverkizCommandParam.AUTO,
         )
+        # Sanitize fan mode: Overkiz is sometimes providing a state that
+        # cannot be used as a command. Convert it to HA space and back to Overkiz
+        if fan_mode not in FAN_MODES_TO_OVERKIZ.values():
+            fan_mode = FAN_MODES_TO_OVERKIZ[OVERKIZ_TO_FAN_MODES[fan_mode]]
+
         hvac_mode = self._control_backfill(
             hvac_mode,
             OverkizState.OVP_MODE_CHANGE,