@zxdavb I am stilling looking for the event that changes the states to unknown. I found this below but it does not point to the cause. 11 out of 12 zones were unknown this morning.
@maesenator did you have any luck figuring it out?
2022-12-23 06:14:23.978 DEBUG (MainThread) [homeassistant.core] Bus:Handling <Event state_changed[L]: entity_id=climate.ensuite, old_state=<state climate.ensuite=off; hvac_modes=[<HVACMode.AUTO: 'auto'>, <HVACMode.HEAT: 'heat'>], min_temp=5.0, max_temp=35.0, target_temp_step=0.1, preset_modes=['none', 'temporary', 'permanent'], current_temperature=18.1, temperature=5.0, hvac_action=idle, preset_mode=none, zone_idx=0B, heating_type=radiator_valve, mode=mode=follow_schedule, setpoint=5.0, config=min_temp=5.0, max_temp=35.0, local_override=False, openwindow_function=False, multiroom_mode=False, schema=_name=Ensuite, class=radiator_valve, sensor=04:116501, actuators=['04:116501'], params=config=min_temp=5.0, max_temp=35.0, local_override=False, openwindow_function=False, multiroom_mode=False, mode=mode=follow_schedule, setpoint=5.0, name=Ensuite, schedule=None, schedule_version=None, icon=mdi:radiator, friendly_name=Ensuite, supported_features=ClimateEntityFeature.PRESET_MODE|TARGET_TEMPERATURE @ 2022-12-23T05:46:23.844603+00:00>, new_state=<state climate.ensuite=unknown; hvac_modes=[<HVACMode.AUTO: 'auto'>, <HVACMode.HEAT: 'heat'>], min_temp=5.0, max_temp=35.0, target_temp_step=0.1, preset_modes=['none', 'temporary', 'permanent'], current_temperature=18.1, temperature=5.0, preset_mode=None, zone_idx=0B, heating_type=radiator_valve, mode=mode=follow_schedule, setpoint=5.0, config=min_temp=5.0, max_temp=35.0, local_override=False, openwindow_function=False, multiroom_mode=False, schema=_name=Ensuite, class=radiator_valve, sensor=04:116501, actuators=['04:116501'], params=config=min_temp=5.0, max_temp=35.0, local_override=False, openwindow_function=False, multiroom_mode=False, mode=mode=follow_schedule, setpoint=5.0, name=Ensuite, schedule=None, schedule_version=None, icon=mdi:radiator, friendly_name=Ensuite, supported_features=ClimateEntityFeature.PRESET_MODE|TARGET_TEMPERATURE @ 2022-12-23T06:14:23.977909+00:00>>