diff --git a/tests/components/flexit_bacnet/conftest.py b/tests/components/flexit_bacnet/conftest.py
index 6fc715da28ef8bdc2b735bec4c2b88d04195f5c9..f0117b415367d651ad821c9f1184fc7c2dc92629 100644
--- a/tests/components/flexit_bacnet/conftest.py
+++ b/tests/components/flexit_bacnet/conftest.py
@@ -59,6 +59,7 @@ def mock_flexit_bacnet() -> Generator[AsyncMock, None, None]:
         flexit_bacnet.air_filter_operating_time = 8820.0
         flexit_bacnet.heat_exchanger_efficiency = 81
         flexit_bacnet.heat_exchanger_speed = 100
+        flexit_bacnet.air_filter_polluted = False
 
         yield flexit_bacnet
 
diff --git a/tests/components/flexit_bacnet/snapshots/test_binary_sensor.ambr b/tests/components/flexit_bacnet/snapshots/test_binary_sensor.ambr
index a6f4137d03ed0be0173c007b8d0c4ac18d90e47a..bf53de3569ccac45a1a29069ec07e3d38744619d 100644
--- a/tests/components/flexit_bacnet/snapshots/test_binary_sensor.ambr
+++ b/tests/components/flexit_bacnet/snapshots/test_binary_sensor.ambr
@@ -40,6 +40,6 @@
     'entity_id': 'binary_sensor.device_name_air_filter_polluted',
     'last_changed': <ANY>,
     'last_updated': <ANY>,
-    'state': 'on',
+    'state': 'off',
   })
 # ---