home-assistant/core · error · HomeAssistantError

Failed to set zone {self.entity_id}: {error}

Error message

Failed to set zone {self.entity_id}: {error}

What it means

HomeAssistantError raised by AirzoneZoneEntity._async_update_hvac_params when the local API call set_hvac_parameters() (API_SYSTEM_ID + API_ZONE_ID + params) fails with AirzoneError. This is the write path behind set_temperature, set_fan_mode, turn_on/off and set_hvac_mode; the zone entity_id plus the library error is shown to the user.

Source

Thrown at homeassistant/components/airzone/entity.py:244

        """Return zone value by key."""
        value = None
        if zone := self.coordinator.data[AZD_ZONES].get(self.system_zone_id):
            if key in zone:
                value = zone[key]
        return value

    async def _async_update_hvac_params(self, params: dict[str, Any]) -> None:
        """Send HVAC parameters to API."""
        _params = {
            API_SYSTEM_ID: self.system_id,
            API_ZONE_ID: self.zone_id,
            **params,
        }
        _LOGGER.debug("update_hvac_params=%s", _params)
        try:
            await self.coordinator.airzone.set_hvac_parameters(_params)
        except AirzoneError as error:
            raise HomeAssistantError(
                f"Failed to set zone {self.entity_id}: {error}"
            ) from error

        self.coordinator.async_set_updated_data(self.coordinator.airzone.data())

View on GitHub (pinned to 58a3fdb3ea)

Solutions

1. Read the embedded library error to distinguish connectivity from parameter rejection.
2. Clamp setpoints to the entity's min_temp/max_temp before calling climate.set_temperature.
3. Retry after confirming the WebServer responds (curl its API endpoint).
4. For repeated failures, reload the integration or reboot the WebServer to clear the stuck HTTP session.

Example fix

# before
await climate.async_set_temperature(temperature=12)

# after
 temp = max(climate.min_temp, min(climate.max_temp, 12))
await climate.async_set_temperature(temperature=temp)

temp = max(entity.min_temp, min(entity.max_temp, temp))
await entity.async_set_temperature(temperature=temp)

try:
    await entity.async_set_temperature(temperature=temp)
except HomeAssistantError as err:
    _LOGGER.warning("Zone write failed: %s", err)

When it happens

Trigger: Any climate service that writes zone parameters — set_temperature with setpoint out of the zone's min/max range, set_fan_mode with an unsupported speed, turn_on/off — while the WebServer errors (connectivity, HTTP status, JSON parse).

Common situations: Automations sending setpoints outside the zone limits configured on the Airzone system; requests racing with a coordinator refresh; flaky Wi-Fi to the bridge.

Related errors

• Mode can't be changed on slave zone {self.entity_id}
• Failed to set system {self.entity_id}: {error}
• Failed to set DHW: {error}
• Heat/Cool is not supported in this mode
• Failed to set temperature to {temperature}.

AI-assisted analysis of home-assistant/core@58a3fdb3ea (2026-08-14). Data as JSON: /api/errors/40aa1508ea511fcc. Report an issue: GitHub.