diff --git a/custom_components/fglair/config_flow.py b/custom_components/fglair/config_flow.py
index 339d615..95d097d 100644
--- a/custom_components/fglair/config_flow.py
+++ b/custom_components/fglair/config_flow.py
@@ -275,7 +275,7 @@ def _run_trial(data: dict[str, Any]) -> tuple[TrialResult, Template, bool]:
     model = str(data.get(CONF_MODEL) or "")
     probed = False
     if not model or detect(model) is None:
-        detected, _probe_props = probe_template(
+        detected, _probe_props, fatal = probe_template(
             data[CONF_HOST],
             data[CONF_DSN],
             data[CONF_LANIP_KEY],
@@ -285,6 +285,9 @@ def _run_trial(data: dict[str, Any]) -> tuple[TrialResult, Template, bool]:
             timeout=TRIAL_TIMEOUT,
         )
         probed = True
+        if fatal is not None:
+            # Модуль недоступен/нет слотов/ключ — вторую сессию не открываем.
+            return TrialResult(ok=False, reason=fatal), template, True
         if detected is not None:
             template = detected
     result = trial_connect(
diff --git a/custom_components/fglair/const.py b/custom_components/fglair/const.py
index f2083c3..c77b718 100644
--- a/custom_components/fglair/const.py
+++ b/custom_components/fglair/const.py
@@ -96,16 +96,16 @@ PRESET_PROP = {
 }
 SWING_MODES = ["off", "on"]
 
-# switch-свойства: prop -> (translation_key, capability bit | None)
-SWITCH_PROPS: dict[Prop, tuple[str, int | None]] = {
-    Prop.ECONOMY_MODE: ("economy_mode", CAP_ECONOMY),
-    Prop.POWERFUL_MODE: ("powerful_mode", CAP_POWERFUL),
-    Prop.COIL_DRY_MODE: ("coil_dry_mode", CAP_COIL_DRY),
-    Prop.MIN_HEAT: ("min_heat", CAP_MIN_HEAT),
-    Prop.OUTDOOR_LOW_NOISE: ("outdoor_low_noise", CAP_OUTDOOR_LOW_NOISE),
-    Prop.HUMAN_DET_AUTO_SAVE: ("human_det_auto_save", None),
-    Prop.WIFI_LED_ENABLE: ("wifi_led_enable", None),
-    Prop.INDOOR_FAN_CONTROL: ("indoor_fan_control", CAP_INDOOR_FAN_CONTROL),
+# switch-свойства: prop -> translation_key (filtracija po FEATURES)
+SWITCH_PROPS: dict[Prop, str] = {
+    Prop.ECONOMY_MODE: "economy_mode",
+    Prop.POWERFUL_MODE: "powerful_mode",
+    Prop.COIL_DRY_MODE: "coil_dry_mode",
+    Prop.MIN_HEAT: "min_heat",
+    Prop.OUTDOOR_LOW_NOISE: "outdoor_low_noise",
+    Prop.HUMAN_DET_AUTO_SAVE: "human_det_auto_save",
+    Prop.WIFI_LED_ENABLE: "wifi_led_enable",
+    Prop.INDOOR_FAN_CONTROL: "indoor_fan_control",
 }
 
 # ---------------------------------------------------------------------------
diff --git a/custom_components/fglair/switch.py b/custom_components/fglair/switch.py
index 496acf1..0f65ca0 100644
--- a/custom_components/fglair/switch.py
+++ b/custom_components/fglair/switch.py
@@ -40,7 +40,7 @@ async def async_setup_entry(hass, entry, async_add_entities) -> None:
     template = runtime.client.template
 
     entities = []
-    for prop, (key, _capability) in SWITCH_PROPS.items():
+    for prop, key in SWITCH_PROPS.items():
         if prop_info(template, prop) is None:
             continue
         if not coordinator.features.enabled(key):
diff --git a/custom_components/fglair/trial.py b/custom_components/fglair/trial.py
index cbc69cc..b5831f7 100644
--- a/custom_components/fglair/trial.py
+++ b/custom_components/fglair/trial.py
@@ -226,11 +226,12 @@ def probe_template(
     device_port: int = 80,
     listen_port: int = 10275,
     timeout: float = 10.0,
-) -> tuple[Template | None, dict[Prop, Value]]:
+) -> tuple[Template | None, dict[Prop, Value], str | None]:
     """Определяет шаблон по ответам, перебирая A/B/F короткими сессиями.
 
-    Используется только когда oem_model неизвестна ядру: для известных
-    моделей шаблон берётся из C-таблиц без лишних подключений.
+    Возвращает (template, properties, fatal_reason): если модуль недоступен
+    (или нет слотов/ключ не тот), перебор бессмыслен и причина возвращается
+    третьим элементом, чтобы вызывающий не открывал ещё одну сессию.
     """
     answered: set[Prop] = set()
     properties: dict[Prop, Value] = {}
@@ -248,10 +249,10 @@ def probe_template(
                 # Модуль доступен, но свойств шаблона нет — пробуем дальше.
                 continue
             # Недоступен/нет слотов/ключ — перебор шаблонов бессмыслен.
-            return None, properties
+            return None, properties, result.reason
         answered |= result.answered
         properties.update(result.properties)
         detected = classify_template(answered)
         if detected is not None:
-            return detected, properties
-    return classify_template(answered), properties
+            return detected, properties, None
+    return classify_template(answered), properties, None
diff --git a/tests/components/fglair/test_config_flow.py b/tests/components/fglair/test_config_flow.py
index 8359c7c..493db91 100644
--- a/tests/components/fglair/test_config_flow.py
+++ b/tests/components/fglair/test_config_flow.py
@@ -580,7 +580,7 @@ async def test_run_trial_probes_unknown_model(hass: HomeAssistant):
     from custom_components.fglair import config_flow as cf
 
     with patch.object(
-        cf, "probe_template", return_value=(Template.B, {})
+        cf, "probe_template", return_value=(Template.B, {}, None)
     ) as probe, patch.object(
         cf, "trial_connect", return_value=TrialResult(ok=True)
     ):
diff --git a/tests/components/fglair/test_features.py b/tests/components/fglair/test_features.py
index eb6338b..bb9b950 100644
--- a/tests/components/fglair/test_features.py
+++ b/tests/components/fglair/test_features.py
@@ -115,7 +115,8 @@ def test_probe_stops_on_unreachable(monkeypatch):
         return tr.TrialResult(ok=False, reason="unreachable")
 
     monkeypatch.setattr(tr, "trial_connect", fake_trial)
-    template, props = tr.probe_template("host", "dsn", "key", 1)
+    template, props, fatal = tr.probe_template("host", "dsn", "key", 1)
     assert template is None
     assert props == {}
+    assert fatal == "unreachable"
     assert calls == [Template.A]