diff --git a/climate/master-bedroom/processing.js b/climate/master-bedroom/processing.js
index d731158..19b761d 100644
--- a/climate/master-bedroom/processing.js
+++ b/climate/master-bedroom/processing.js
@@ -292,7 +292,7 @@ let sendAcFan = {
             "entity_id": ["climate.master_bedroom_aircon"]
         },
         "data": {
-            "fan_mode": "Auto"
+            "fan_mode": "auto"
         }
     }
 }