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Zigbee devices Thermostats and radiator valves

Aqara WT-A03E

Radiator thermostat W600. Works with Zigbee2MQTT with no vendor hub or cloud: it pairs with a Zigbee stick and shows up in Home Assistant.

Vendor
Aqara
Model
WT-A03E
Type
Thermostats and radiator valves
Power
battery: an end device, does not extend the mesh
Firmware updates (OTA)
yes, through Zigbee2MQTT

Find it in shops: AliExpress

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What it exposes

FeaturePropertyValuesControl
Batterybattery% · 0…100read only
VoltagevoltagemVread only
Valve alarmvalve_alarm—read only
Window openwindow_open—read only
Climatelocal_temperature, local_temperature_calibration, occupied_heating_setpoint, system_mode, running_state, presetroom temperature, local_temperature_calibration, heating setpoint, mode, running state, presetsettable
Manual Override Durationtemperature_setpoint_hold_durationmin · 0…65535settable
Manual Overrideoverride_active—read only
Internal sensor temperaturelocal_temperature_internal°Cread only
Temperature sourcesensorinternal, externalsettable
External temperature inputexternal_temperature_input°C · -40…125settable
External temperature problemexternal_temperature_problem—read only
Calibratecalibratestartsettable
Calibration statuscalibratednot_ready, ready, error, in_progressread only
Temperature control abnormal notificationtemperature_control_abnormal_notification—settable
Display flipdisplay_flip—settable
Open window detectionwindow_detection—settable
Child lockchild_lock—settable
Anti freeze temperatureanti_freeze_temperature°C · 5…15settable
Home temperaturepreset_home_temperature°C · 5…30settable
Away temperaturepreset_away_temperature°C · 5…30settable
Sleep temperaturepreset_sleep_temperature°C · 5…30settable
Vacation temperaturepreset_vacation_temperature°C · 5…30settable
Wind down temperaturepreset_wind_down_temperature°C · 5…30settable
Sunday scheduleweekly_schedule_sunday—settable
Monday scheduleweekly_schedule_monday—settable
Tuesday scheduleweekly_schedule_tuesday—settable
Wednesday scheduleweekly_schedule_wednesday—settable
Thursday scheduleweekly_schedule_thursday—settable
Friday scheduleweekly_schedule_friday—settable
Saturday scheduleweekly_schedule_saturday—settable
Save schedulesave_scheduletriggersettable
Clear scheduleclear_scheduletriggersettable
Positionposition% · 0…100read only
Identifyidentifyidentifysettable

MQTT: state and commands

Zigbee2MQTT publishes the device state to zigbee2mqtt/my_device (my_device is the name you give the device). An example message:

{
  "battery": 87,
  "voltage": 2950,
  "valve_alarm": false,
  "window_open": false,
  "local_temperature": 20.5,
  "occupied_heating_setpoint": 21,
  "system_mode": "heat",
  "temperature_setpoint_hold_duration": 32768,
  "override_active": false,
  "local_temperature_internal": 0,
  "sensor": "internal",
  "external_temperature_input": 43,
  "external_temperature_problem": false,
  "calibrate": "start",
  "linkquality": 120
}

Send commands to zigbee2mqtt/my_device/set:

mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"occupied_heating_setpoint":21.5}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"system_mode":"heat"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"sensor":"external"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"temperature_control_abnormal_notification":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"display_flip":true}'

Watch the topics live from the browser: MQTT client.

Home Assistant automation example

Zigbee2MQTT creates Home Assistant entities from the device name. If it is called my_device, an automation in automations.yaml can look like this:

- alias: "Cooler at night"
  mode: single
  triggers:
    - trigger: time
      at: "23:00:00"
  actions:
    - action: climate.set_temperature
      target:
        entity_id: climate.my_device
      data:
        temperature: 18

Check the YAML: YAML checker.

How to pair it

  1. In Zigbee2MQTT click Permit join.
  2. Put the device in pairing mode: usually a long press of the reset button (5–10 s) until the LED blinks; bulbs: switch the power off and on 5–6 times.
  3. Keep the device close to the coordinator or a router while pairing.
  4. Give it a clear name: MQTT topics and Home Assistant entities are built from it.

Exact procedure and model notes: the device page in the Zigbee2MQTT docs. No coordinator yet: coordinator picker.

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