Acova Alcantara 2 radiator incorrect behavior

[DeadlockState]

What happened?

Hi,

Since my migration from ZHA to Zigbee2MQTT my Acova Alcantara 2 radiators facing incorrect behavior using Home Assistant Thermostat card

On ZHA (normal behavior) :

Off :

Developer tools > States :

State : off
State attributes (YAML) :

hvac_modes:
  - "off"
  - heat
min_temp: 7
max_temp: 28
current_temperature: null
temperature: null
hvac_action: "off"
occupancy: 1
occupied_cooling_setpoint: 2600
occupied_heating_setpoint: 2800
system_mode: "[<SystemMode.Off: 0>]/off"
unoccupied_heating_setpoint: 1550
friendly_name: Radiateur Bureau
supported_features: 385

• current_temperature is always null because the radiator cannot return mesured current temperature
• temperature becomes null when hvac_action is "off"
• hvac_action becomes "off"

Heat :

Developer tools > States :

State : heat
State attributes (YAML) :

hvac_modes:
  - "off"
  - heat
min_temp: 7
max_temp: 28
current_temperature: null
temperature: 19
hvac_action: idle
occupancy: 1
occupied_cooling_setpoint: 2600
occupied_heating_setpoint: 1900
system_mode: "[<SystemMode.Auto: 1>]/heat"
unoccupied_heating_setpoint: 900
friendly_name: Radiateur Bureau
supported_features: 385

On Zigbee2MQTT (incorrect behavior) :

Off :

Developer tools > States :

State : off
State attributes (YAML) :

hvac_modes:
  - "off"
  - heat
  - auto
min_temp: 7
max_temp: 28
current_temperature: null
temperature: 19
hvac_action: idle
friendly_name: Radiateur Bureau
supported_features: 385

• current_temperature is always null because the radiator cannot return mesured current temperature (introduced in this PR Deactivate unneeded local temperature exposed property for Acova Alcantara 2 and Alcantara 3 zigbee-herdsman-converters#12344)
• temperature doesn't changes, occupied_heating_setpoint must be changed to null when system_mode/hvac_action is "off"
• hvac_action stays on idle, it must changes to "off" when system_mode is off (that's I tried to fix in this PR Fix system mode and off mode display for Acova Alcantara 2 and Alcantara 3 zigbee-herdsman-converters#12267)

Zigbee2MQTT message :

{"linkquality":104,"local_temperature":null,"occupied_heating_setpoint":19,"running_state":"idle","system_mode":"off","unoccupied_heating_setpoint":15.5}

Heat :

Developer tools > States :

State : heat
State attributes (YAML) :

hvac_modes:
  - "off"
  - heat
  - auto
min_temp: 17
max_temp: 21
target_temp_step: 0.5
current_temperature: null
temperature: 19
hvac_action: idle
friendly_name: Radiateur Bureau
supported_features: 385

Zigbee2MQTT message :

{"linkquality":104,"local_temperature":null,"occupied_heating_setpoint":19,"running_state":"idle","system_mode":"heat","unoccupied_heating_setpoint":15.5}

What did you expect to happen?

No response

How to reproduce it (minimal and precise)

No response

Zigbee2MQTT version

2.11.0

Adapter firmware version

EmberZNet Revision: 8.0.2 [GA]

Adapter

SONOFF Zigbee 3.0 USB Dongle Plus (ZBDongle-E)

Setup

Zigbee2MQTT App on Home Assistant OS (Core 2026.5.4, Supervisor 2026.05.1, Operating System 17.3, Frontend 20260429.4) on a Raspberry Pi 5 8 GB with SONOFF Zigbee 3.0 USB Dongle Plus (ZBDongle-E) adapter

Device database.db entry

No response

Debug log

No response

Notes

Available for debug session over Google Meet if needed