Heating won't start until kickstart from Z2M

[oleksii-kalinin]

Prerequisites

• [X] Saswell SEA801-Zigbee/SEA802-Zigbee
• [x] Output from Home Assistant Developer Tools state e.g.
• [x] Output from Home Assistant Device Diagnostic from BT

{
  "home_assistant": {
    "installation_type": "Home Assistant OS",
    "version": "2023.11.2",
    "dev": false,
    "hassio": true,
    "virtualenv": false,
    "python_version": "3.11.6",
    "docker": true,
    "arch": "x86_64",
    "timezone": "Europe/Warsaw",
    "os_name": "Linux",
    "os_version": "6.1.59",
    "supervisor": "2023.11.0",
    "host_os": "Home Assistant OS 11.1",
    "docker_version": "24.0.6",
    "chassis": "vm",
    "run_as_root": true
  },
  "custom_components": {
    ....
    "better_thermostat": {
      "version": "1.4.0",
      "requirements": []
    }
    ....
  },
  "integration_manifest": {
    "domain": "better_thermostat",
    "name": "Better Thermostat",
    "after_dependencies": [
      "climate"
    ],
    "codeowners": [
      "@kartoffeltoby"
    ],
    "config_flow": true,
    "dependencies": [
      "climate",
      "recorder"
    ],
    "documentation": "https://github.com/KartoffelToby/better_thermostat",
    "iot_class": "local_push",
    "issue_tracker": "https://github.com/KartoffelToby/better_thermostat/issues",
    "requirements": [],
    "version": "1.4.0",
    "is_built_in": false
  },
  "data": {
    "info": {
      "name": "Living room",
      "temperature_sensor": "sensor.climate_living_room_temperature",
      "off_temperature": 12,
      "humidity_sensor": "sensor.climate_living_room_humidity",
      "window_sensors": "binary_sensor.all_windows",
      "weather": "weather.forecast_home",
      "outdoor_sensor": null,
      "window_off_delay": 0,
      "model": "SEA801-Zigbee/SEA802-Zigbee",
      "tolerance": 0.1,
      "window_off_delay_after": 0
    },
    "thermostat": {
      "climate.trv_living_room": {
        "name": "TRV Living room",
        "state": "heat",
        "attributes": {
          "hvac_modes": [
            "off",
            "heat",
            "auto"
          ],
          "min_temp": 5.0,
          "max_temp": 30.0,
          "target_temp_step": 0.5,
          "current_temperature": 21.8,
          "temperature": 23.0,
          "anti_scaling": "ON",
          "away_mode": "OFF",
          "battery_low": false,
          "child_lock": "LOCK",
          "current_heating_setpoint": 23,
          "frost_detection": "ON",
          "heating": "OFF",
          "last_seen": "2023-11-13T14:15:13+01:00",
          "linkquality": 255,
          "local_temperature": 21.8,
          "local_temperature_calibration": 0,
          "system_mode": "heat",
          "window_detection": "ON",
          "friendly_name": "TRV Living room",
          "supported_features": 1
        },
        "bt_config": {
          "calibration": "local_calibration_based",
          "calibration_mode": "default",
          "protect_overheating": false,
          "no_off_system_mode": false,
          "heat_auto_swapped": false,
          "child_lock": false,
          "homaticip": false
        },
        "bt_adapter": "mqtt",
        "bt_integration": "mqtt",
        "model": "SEA801-Zigbee/SEA802-Zigbee"
      }
    },
    "external_temperature_sensor": {
      "entity_id": "sensor.climate_living_room_temperature",
      "state": "22.09",
      "attributes": {
        "state_class": "measurement",
        "battery": 93,
        "humidity": 49.81,
        "last_seen": "2023-11-13T14:16:55+01:00",
        "linkquality": 255,
        "temperature": 22.09,
        "voltage": 2900,
        "unit_of_measurement": "\u00b0C",
        "device_class": "temperature",
        "friendly_name": "Climate Living room Temperature"
      },
      "last_changed": "2023-11-13T13:16:55.137487+00:00",
      "last_updated": "2023-11-13T13:16:55.218797+00:00",
      "context": {
        "id": "01HF4D7WHJ2BF6335V652X89MV",
        "parent_id": null,
        "user_id": null
      }
    },
    "window_sensor": {
      "entity_id": "binary_sensor.all_windows",
      "state": "off",
      "attributes": {
        "entity_id": [
          "binary_sensor.window_kitchen_contact",
          "binary_sensor.window_living_room_contact",
          "binary_sensor.window_bedroom_contact"
        ],
        "friendly_name": "All Windows"
      },
      "last_changed": "2023-11-13T11:15:37.447505+00:00",
      "last_updated": "2023-11-13T11:15:37.447505+00:00",
      "context": {
        "id": "01HF469SAQ1SA4G878ESWR7AZG",
        "parent_id": null,
        "user_id": null
      }
    }
  }
}

Description

It's about 1.3 degrees below the heater target but BT won't enable heating. I need to manually set Local temperature calibration to -1 and then BT adjusts it independently.

Steps to Reproduce

Expected behavior:

Heating starts when the temperature lowers below the target

Actual behavior:

Versions

HA: 2023.11.2 BT: 1.4.0

Additional Information

[oleksii-kalinin]

And the heating won't stop as well. Temperature reported by external sensor: 23.3. State of BT on the screenshot. Expected to heat stops after 23 degrees are reached.

{
    "anti_scaling": "ON",
    "away_mode": "OFF",
    "battery_low": false,
    "child_lock": "LOCK",
    "current_heating_setpoint": 23,
    "frost_detection": "ON",
    "heating": "ON",
    "last_seen": "2023-11-25T14:00:42+01:00",
    "linkquality": 196,
    "local_temperature": 22.8,
    "local_temperature_calibration": -1,
    "preset_mode": "none",
    "system_mode": "heat",
    "window_detection": "ON"
}

2023-11-25 14:12:48.025 INFO (MainThread) [custom_components.better_thermostat.climate] better_thermostat Living Room: startup completed.
2023-11-25 14:13:41.108 DEBUG (MainThread) [custom_components.better_thermostat.events.trv] better_thermostat Living Room: TRV climate.trv_living_room update received
2023-11-25 14:13:41.116 DEBUG (MainThread) [custom_components.better_thermostat.events.trv] better_thermostat Living Room: TRV climate.trv_living_room sends new internal temperature from 22.8 to 23.4
2023-11-25 14:13:41.117 DEBUG (MainThread) [custom_components.better_thermostat.events.trv] better_thermostat Living Room: trigger_trv_change / _old_heating_setpoint: 23.0 - _new_heating_setpoint: 23.0 - _last_temperature: 23.0

[flxtr]

I have the same issue with a SAE802 and TV02.

• When BT external temperature crosses the line of BT set-point, then calibration immediately kicks in, as expected.
• But when the BT set-point changes in a way that it crosses the line of BT external temperature, it sometimes takes several hours for a calibration to take place.

Due to the hysteresis of these thermostats, they effectively stay closed, until local temp drops by something between 1 to 2 kelvin below set-point, so immediate calibration is needed, when BT set-point changes.

Example:

Set-points of BT and actual thermostat are in sync, but actual heating starts about an hour after the set-point change. (This is basically a fault by the actual thermostat. But for my understanding, BT want's to fix those issues.)

Actual thermostat: "Heizkörper Kinderzimmer" Better Thermostat with external temperature sensor: "BT Kindezimmer"

At 6:00 the set-point of BT where set to 20°C:

At 8:26 the first calibration happens to the actual thermostat (apparent drop of local temp at actual termostat):

I looked at the code, but I don't know much about HA programming and couldn't figure myself what triggers calibration and what has to be changed to make calibration happen on any set-point change.

The only thing that helps—like @oleksii-kalinin wrote—is to "kickstart" heating by manually setting the local calibration value of the actual thermostat to a negative value.