diff --git a/CHANGELOG.md b/CHANGELOG.md
index 61c7fd3..892e5af 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
+- Venetian-blind slats are handled as the blind's tilt: a slat GA (Lamelle / slat /
+  ламель / tilt) is attached to its parent blind cover as `move_short_address` instead of
+  becoming a standalone cover; an unmatched slat is flagged `shutter_slat_unattached` for
+  manual attachment rather than emitted wrong.
+- A 1-bit diagnostics GA (wind/frost/rain/smoke/leak alarm, fault) is now a read-only
+  `binary_sensor` instead of a phantom command switch.
 - HA generation never drops a group address silently ("no silent caps"): every GA is
   either emitted as an entity or listed in the `review` output, and the YAML header states
   how many need manual review.
diff --git a/nickol_knx_mcp/generate_ha.py b/nickol_knx_mcp/generate_ha.py
index 1ba5bbe..6de19da 100644
--- a/nickol_knx_mcp/generate_ha.py
+++ b/nickol_knx_mcp/generate_ha.py
@@ -17,11 +17,34 @@ from .project import LoadedProject, GARecord
 from .analyze import _is_status_ga
 from .pairing import find_status, base_tokens, function_status_pairs
 
+# Venetian-blind slat (tilt) detection: a slat GA is the tilt of its parent
+# blind, not a standalone cover.
+_SLAT_WORDS = ("lamelle", "lamel", "ламел", "slat", "louver", "louvre", "tilt")
+_DIR_WORDS = {"auf", "ab", "up", "down", "hoch", "runter", "move", "step",
+              "long", "short", "open", "close", "вверх", "вниз"}
+_BLIND_GENERIC = {"behang", "blind", "blinds", "shutter", "jalousie", "rollo",
+                  "roller", "store", "markise", "roll", "cover", "curtain",
+                  "штора", "жалюзи", "ролета", "ролл"}
+
+
+def _is_slat(name: str) -> bool:
+    low = name.lower()
+    return any(w in low for w in _SLAT_WORDS)
+
+
+def _ident_tokens(name: str) -> set:
+    """Identity/zone tokens for matching a slat to its blind (drop direction,
+    slat and generic-blind words so only the zone/name identity remains)."""
+    return {t for t in base_tokens(name)
+            if t not in _DIR_WORDS and t not in _SLAT_WORDS and t not in _BLIND_GENERIC}
+
 
 def generate_ha_yaml(project: LoadedProject) -> dict[str, Any]:
     """Return {'yaml': str, 'review': [...], 'counts': {...}}."""
     status_gas = [g for g in project.gas.values() if _is_status_ga(g)]
     fpairs = function_status_pairs(project)  # authoritative cmd-addr -> status-addr
+    slat_addrs = {g.address for g in project.gas.values()
+                  if g.category == "shutter" and _is_slat(g.name)}
 
     def status_for(cmd: GARecord):
         # 1. ETS Function role pairing is authoritative (names not needed).
@@ -47,7 +70,8 @@ def generate_ha_yaml(project: LoadedProject) -> dict[str, Any]:
     for ga in project.gas.values():
         if ga.address in consumed:
             continue
-        if ga.category == "shutter" and ga.dpt_main == 1 and ga.dpt_sub == 8:
+        if ga.category == "shutter" and ga.dpt_main == 1 and ga.dpt_sub == 8 \
+                and ga.address not in slat_addrs:
             entity = {"name": ga.name, "move_long_address": ga.address}
             for sib in same_main_gas(ga):
                 if sib.address in consumed or sib.address == ga.address:
@@ -57,6 +81,12 @@ def generate_ha_yaml(project: LoadedProject) -> dict[str, Any]:
                 if sib.dpt_main == 1 and sib.dpt_sub == 10:
                     entity["move_short_address"] = sib.address
                     consumed.add(sib.address)
+                elif sib.address in slat_addrs and sib.dpt_main == 1 \
+                        and "move_short_address" not in entity \
+                        and (_ident_tokens(ga.name) & _ident_tokens(sib.name)):
+                    # venetian slat (tilt) = the short-move/step of this blind
+                    entity["move_short_address"] = sib.address
+                    consumed.add(sib.address)
                 elif sib.dpt_main == 5 and sib.kind == "command":
                     entity["position_address"] = sib.address
                     consumed.add(sib.address)
@@ -148,10 +178,16 @@ def generate_ha_yaml(project: LoadedProject) -> dict[str, Any]:
             "address": addr, "name": ga.name, "dpt": ga.dpt,
             "category": ga.category, "kind": ga.kind,
         }
+        # A slat/tilt GA that wasn't matched to a blind cover by name.
+        if ga.address in slat_addrs:
+            item["reason"] = "shutter_slat_unattached"
+            item["hint"] = ("Slat/tilt control of a venetian blind; could not be matched "
+                            "to a blind cover by name. Attach it manually as the cover's "
+                            "tilt/move_short address.")
         # A shutter-looking command that didn't become a cover almost always has
         # an incomplete DPT (e.g. bare "1" instead of 1.008 up/down). Make that
         # actionable instead of an opaque drop.
-        if ga.category == "shutter" and ga.kind == "command" and ga.dpt_sub is None:
+        elif ga.category == "shutter" and ga.kind == "command" and ga.dpt_sub is None:
             item["reason"] = "shutter_incomplete_dpt"
             item["hint"] = ("Looks like a shutter control but the DPT has no sub-type. "
                             "Set it in ETS (1.008 up/down, 1.010 stop, 5.001 position) "
diff --git a/nickol_knx_mcp/project.py b/nickol_knx_mcp/project.py
index c458b99..f384011 100644
--- a/nickol_knx_mcp/project.py
+++ b/nickol_knx_mcp/project.py
@@ -183,6 +183,11 @@ def build_loaded_from_raw(raw: KNXProject, path: str) -> LoadedProject:
         # correct the HA platform so the generator builds a cover, not a light.
         if category == "shutter" and ha_platform in ("light", "switch"):
             ha_platform = "cover"
+        # A 1-bit diagnostics GA (wind/frost/rain/smoke/leak alarm, fault) is a
+        # read-only input, not a command switch -> binary_sensor.
+        if category == "diagnostics" and main == 1 and ha_platform == "switch":
+            ha_platform = "binary_sensor"
+            kind = "sensor"
         m, mid, s = _split_three_level(ga.get("address", addr))
         rec = GARecord(
             address=ga.get("address", addr),
diff --git a/tests/test_pipeline.py b/tests/test_pipeline.py
index b74d3e0..8b67bdb 100644
--- a/tests/test_pipeline.py
+++ b/tests/test_pipeline.py
@@ -198,3 +198,25 @@ for _name in ("Behang D auf/ab", "Lamelle B auf/ab"):
     _cat = _refine_category(_name, "unknown")
     assert _cat == "shutter", f"{_name!r} -> {_cat}, expected shutter"
 print("OK: 'Behang/Lamelle auf/ab' classified as shutter")
+
+# --------------------------------------------------------------------------- #
+# Regression (#6): a venetian slat becomes the tilt (move_short) of its blind,
+# not a standalone cover; a 1-bit diagnostics alarm is a binary_sensor, not a
+# phantom command switch.
+# --------------------------------------------------------------------------- #
+print("\n=== REGRESSION: slat tilt + diagnostics alarm ===")
+from nickol_knx_mcp.project import build_loaded_from_raw
+_raw6 = {"group_addresses": {
+    "2/0/0": ga("2/0/0", "Living room blind", 1, 8),
+    "2/0/1": ga("2/0/1", "Living room blind slat", 1, 8),
+    "2/0/2": ga("2/0/2", "Wind alarm", 1, 1),
+}}
+_p6 = build_loaded_from_raw(_raw6, "mem")
+assert _p6.gas["2/0/2"].ha_platform == "binary_sensor", _p6.gas["2/0/2"].ha_platform
+assert _p6.gas["2/0/2"].kind == "sensor", _p6.gas["2/0/2"].kind
+_pkg6 = _yaml.safe_load(generate_ha_yaml(_p6)["yaml"].split("\n\n", 1)[1])
+_covers6 = _pkg6["knx"].get("cover", [])
+assert len(_covers6) == 1, f"expected 1 cover (slat not standalone), got {len(_covers6)}"
+assert _covers6[0].get("move_short_address") == "2/0/1", _covers6[0]
+assert _pkg6["knx"].get("binary_sensor"), "wind alarm should be a binary_sensor"
+print("OK: slat -> blind tilt; wind alarm -> binary_sensor")