diff --git a/tests/components/flexit_bacnet/conftest.py b/tests/components/flexit_bacnet/conftest.py
index 6fc715da28e..f0117b41536 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 a6f4137d03e..bf53de3569c 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',
   })
 # ---