diff --git a/components/samsung_ac/__init__.py b/components/samsung_ac/__init__.py
index 0affde4..bf6e49d 100644
--- a/components/samsung_ac/__init__.py
+++ b/components/samsung_ac/__init__.py
@@ -195,6 +195,7 @@ def error_code_sensor_schema(message: int):
         unit_of_measurement="",
         accuracy_decimals=0,
         icon="mdi:alert",
+        entity_category="diagnostic",
     )