diff --git a/homeassistant/components/cover/device_action.py b/homeassistant/components/cover/device_action.py
index 29dd97909e3..490ce162d9a 100644
--- a/homeassistant/components/cover/device_action.py
+++ b/homeassistant/components/cover/device_action.py
@@ -49,7 +49,9 @@ POSITION_ACTION_SCHEMA = cv.DEVICE_ACTION_BASE_SCHEMA.extend(
     {
         vol.Required(CONF_TYPE): vol.In(POSITION_ACTION_TYPES),
         vol.Required(CONF_ENTITY_ID): cv.entity_domain(DOMAIN),
-        vol.Required("position"): vol.All(vol.Coerce(int), vol.Range(min=0, max=100)),
+        vol.Optional("position", default=0): vol.All(
+            vol.Coerce(int), vol.Range(min=0, max=100)
+        ),
     }
 )
 
diff --git a/homeassistant/helpers/config_validation.py b/homeassistant/helpers/config_validation.py
index acf6139708a..d47ba30c114 100644
--- a/homeassistant/helpers/config_validation.py
+++ b/homeassistant/helpers/config_validation.py
@@ -266,7 +266,7 @@ def entity_id(value: Any) -> str:
     if valid_entity_id(str_value):
         return str_value
 
-    raise vol.Invalid(f"Entity ID {value} is an invalid entity id")
+    raise vol.Invalid(f"Entity ID {value} is an invalid entity ID")
 
 
 def entity_ids(value: Union[str, List]) -> List[str]: