Error in HA with fritz_dect_301 Thermostat

[Mark-Muc]

Hello . anybody elese got this error by using fritz_dect_301 Thermostats?
Error:

Logger: custom_components.versatile_thermostat.underlyings
Quelle: custom_components/versatile_thermostat/underlyings.py:215
Integration: Versatile Thermostat (Dokumentation, Probleme)
Erstmals aufgetreten: 3. Juni 2026 um 20:00:00 (4 Vorkommnisse)
Zuletzt protokolliert: 08:00:00

1. OG Vorraum (Versatile)-climate.fritz_dect_301_nord - Error calling service climate.set_temperature: must contain at least one of temperature, target_temp_high, target_temp_low.. The underlying will not change its state.
1. OG Vorraum (Versatile)-climate.fritz_dect_301_ost - Error calling service climate.set_temperature: must contain at least one of temperature, target_temp_high, target_temp_low.. The underlying will not change its state.

Regards
Mark-Muc

[jmcollin78]

Hello, your error seems a misconfiguration and not due to fritz_dect_301. Set_temperature should always send at least a temperature.
Can you send your custom attributes as explained here: https://www.versatile-thermostat.org/fr/docs/reference/#attributs-personnalis%C3%A9s

[Mark-Muc]

Hello and thanky you fpr looking into this:
Here are the requested information:

climate.1_og_vorraum_versatile:

hvac_modes:
  - heat
  - "off"
min_temp: 7
max_temp: 35
target_temp_step: 0.5
preset_modes:
  - none
  - frost
  - eco
  - comfort
  - boost
current_temperature: 22.9
temperature: 19
hvac_action: idle
preset_mode: comfort
hvac_mode: heat
ema_temp: 22.9
is_ready: true
specific_states:
  is_initialized: true
  is_on: true
  last_central_mode: null
  last_update_datetime: "2026-06-07T09:00:33.780325+02:00"
  ext_current_temperature: 17.8
  last_temperature_datetime: "2026-06-07T08:23:46.579845+02:00"
  last_ext_temperature_datetime: "2026-06-07T08:42:18.135397+02:00"
  should_device_be_active: false
  is_device_active: false
  device_actives: []
  nb_device_actives: 0
  ema_temp: 22.9
  temperature_slope: 0
  hvac_off_reason: null
  total_energy: 0
  last_change_time_from_vtherm: "2026-06-07T08:00:00.007812+02:00"
  is_sleeping: false
  is_locked: true
  is_recalculate_scheduled: true
  not_initialized_entities: []
  messages: []
configuration:
  ac_mode: false
  type: over_climate
  proportional_function: null
  is_controlled_by_central_mode: false
  target_temperature_step: 0.5
  timezone: Europe/Berlin
  temperature_unit: °C
  is_used_by_central_boiler: false
  max_on_percent: null
  have_valve_regulation: false
  cycle_min: 5
preset_temperatures:
  frost_temp: 7
  eco_temp: 17
  boost_temp: 20
  comfort_temp: 19
  frost_away_temp: 0
  eco_away_temp: 0
  boost_away_temp: 0
  comfort_away_temp: 0
current_state:
  hvac_mode: heat
  target_temperature: 19
  preset: comfort
requested_state:
  hvac_mode: heat
  target_temperature: null
  preset: comfort
is_presence_configured: false
is_power_configured: false
power_manager:
  device_power: 0
  mean_cycle_power: null
is_motion_configured: false
is_window_configured: true
is_window_auto_configured: false
window_manager:
  window_state: "off"
  window_auto_state: unavailable
  window_action: window_turn_off
  is_window_bypass: false
  window_sensor_entity_id: binary_sensor.dachflaechenfenster_nord
  window_delay_sec: 30
  window_off_delay_sec: 300
  window_auto_open_threshold: 3
  window_auto_close_threshold: 1
  window_auto_max_duration: 60
is_safety_configured: true
safety_manager:
  safety_state: "off"
  safety_delay_min: 1440
  safety_min_on_percent: 0.5
  safety_default_on_percent: 0.1
is_lock_configured: true
lock_manager:
  is_locked: true
  lock_users: true
  lock_automations: false
  lock_code: false
  auto_relock_sec: 15
timed_preset_manager:
  is_active: false
  preset: null
  original_preset: null
  end_time: null
  remaining_time_min: 0
is_heating_failure_detection_configured: false
is_repair_incorrect_state_configured: false
is_auto_start_stop_configured: false
fan_mode: null
fan_modes: []
is_over_climate: true
regulation_accumulated_error: -576
regulated_target_temperature: 17
vtherm_over_climate:
  start_hvac_action_date: null
  last_mean_power_cycle: 0
  underlying_entities:
    - climate.fritz_dect_301_nord
    - climate.fritz_dect_301_ost
  is_regulated: true
  auto_fan_mode: auto_fan_none
  current_auto_fan_mode: auto_fan_none
  auto_activated_fan_mode: null
  auto_deactivated_fan_mode: null
  follow_underlying_temp_change: false
  auto_regulation_use_device_temp: false
  regulation:
    regulated_target_temperature: 17
    auto_regulation_mode: auto_regulation_slow
    regulation_accumulated_error: -576
friendly_name: 1. OG Vorraum (Versatile)
supported_features: 401

Regarda
Mark-Muc

[jmcollin78]

Hello,

I don't see anything wrong. You have a target temperature (19 due to Comfort preset).

Can you show me the attributes of climate.fritz_dect_301_nord ? (Dev Tools / State)

[Mark-Muc]

here are the 2 climate. in question:

climate.fritz_dect_301_nord
hvac_modes:
  - heat
  - "off"
min_temp: 8
max_temp: 28
preset_modes:
  - summer
current_temperature: 23.5
preset_mode: summer
friendly_name: "FRITZ!Smart Thermo 301 #1 (Ost)"
supported_features: 16

climate.fritz_dect_301_ost
hvac_modes:
  - heat
  - "off"
min_temp: 8
max_temp: 28
preset_modes:
  - summer
current_temperature: 24
preset_mode: summer
friendly_name: "FRITZ!Smart Thermo 301 #2 (Nord)"
supported_features: 16

[jmcollin78]

Ok so the issue is that your device don't support to change the target temperature.
supported_features: 16 is very basic. Your devices only accept FAN_MODE and not set_temperature.

So you can't use VTherm with this devices.

[Mark-Muc]

oh , it's Fritz-Dect and it was in "summer" mode .. i took it out in the configuration of the box and let's see the attributes are changing!!
I can remember, that it worked to set the target temperature..
Look @ this tomorrow!!
Regards & Thx
Mark-Muc

It changes to this now:

hvac_modes:
  - heat
  - "off"
min_temp: 8
max_temp: 28
preset_modes:
  - eco
  - comfort
  - boost
current_temperature: 23.5
temperature: 19
preset_mode: comfort
friendly_name: "FRITZ!Smart Thermo 301 #1 (Ost)"
**supported_features: 401**

[jmcollin78]

ok. And is it now working as expected ?
If yes please explain waht you do for the others which will fall into this trap.

Can you please create a new entry in the list of compatible devices here: https://www.versatile-thermostat.org/en/devices/

Click on "Add a device" and fill the form. Thank you for others !