diff --git a/src/lvmopstools/actor.py b/src/lvmopstools/actor.py
index fd1c9bb..6e6286f 100644
--- a/src/lvmopstools/actor.py
+++ b/src/lvmopstools/actor.py
@@ -32,9 +32,9 @@
     "CheckError",
     "ActorState",
     "ErrorCodes",
+    "ErrorCodesBase",
     "ErrorData",
-    "extend_enum",
-    "verify_error_codes",
+    "create_error_codes",
 ]
 
 
@@ -66,35 +66,6 @@
 }
 
 
-def extend_enum(inherited_enum):
-    """A decorator to extend an enum with new values.
-
-    Taken from https://stackoverflow.com/a/64045773
-
-    """
-
-    def wrapper(added_enum):
-        joined = {}
-        for item in inherited_enum:
-            joined[item.name] = item.value
-        for item in added_enum:
-            joined[item.name] = item.value
-
-        new_enum_class = enum.Enum(added_enum.__name__, joined)
-
-        # Add methods from the inherited class.
-        for attr in inherited_enum.__dict__:
-            if attr.startswith("__"):
-                continue
-            if hasattr(new_enum_class, attr):
-                continue
-            setattr(new_enum_class, attr, getattr(inherited_enum, attr))
-
-        return new_enum_class
-
-    return wrapper
-
-
 class ActorState(enum.Flag):
     """Defines the possible states of the actor."""
 
@@ -121,24 +92,9 @@ class ErrorData:
     description: str = ""
 
 
-class verify_error_codes:
-    """Verifies that all error codes are instances of ErrorData."""
-
-    def __call__(self, enumeration):
-        for enum_item in enumeration.__members__.values():
-            if not isinstance(enum_item.value, ErrorData):
-                name = enum_item.name
-                raise ValueError(f"Error code {name} must be an instance of ErrorData.")
-
-        return enumeration
-
-
-@verify_error_codes()
-class ErrorCodes(enum.Enum):
+class ErrorCodesBase(enum.Enum):
     """Enumeration of error codes"""
 
-    UNKNOWN = ErrorData(9999, True, "Unknown error.")
-
     @classmethod
     def get_error_code(cls, error_code: int):
         """Returns the :obj:`.ErrorCodes` that matches the ``error_code`` value."""
@@ -150,6 +106,28 @@ def get_error_code(cls, error_code: int):
         raise ValueError(f"Error code {error_code} not found.")
 
 
+def create_error_codes(
+    error_codes: dict[str, tuple | list | ErrorData],
+    name: str = "ErrorCodes",
+    include_unknown: bool = True,
+) -> Any:
+    """Creates an enumeration of error codes."""
+
+    error_codes_enum: dict[str, ErrorData] = {}
+    for error_name, error_data in error_codes.items():
+        if not isinstance(error_data, ErrorData):
+            error_data = ErrorData(*error_data)
+        error_codes_enum[error_name.upper()] = error_data
+
+    if include_unknown and "UNKNOWN" not in error_codes_enum:
+        error_codes_enum["UNKNOWN"] = ErrorData(9999, True, "Unknown error")
+
+    return ErrorCodesBase(name, error_codes_enum)
+
+
+ErrorCodes = create_error_codes({"UNKNOWN": ErrorData(9999, True, "Unknown error")})
+
+
 @click.command(cls=CluCommand, name="actor-state")
 async def actor_state(command: Command[LVMActor], *args, **kwargs):
     """Returns the actor state."""
@@ -189,7 +167,7 @@ class CheckError(Exception):
     def __init__(
         self,
         message: str = "",
-        error_code: ErrorCodes | int = ErrorCodes.UNKNOWN,
+        error_code: ErrorCodesBase | int = ErrorCodes.UNKNOWN,
     ):
         if isinstance(error_code, int):
             self.error_code = ErrorCodes.get_error_code(error_code)
@@ -324,7 +302,7 @@ def update_state(
 
     async def troubleshoot(
         self,
-        error_code: ErrorCodes = ErrorCodes.UNKNOWN,
+        error_code: ErrorCodesBase = ErrorCodes.UNKNOWN,
         exception: Exception | None = None,
         traceback_frame: int = 0,
     ):
@@ -394,7 +372,7 @@ async def _check_internal(self):
     @abc.abstractmethod
     async def _troubleshoot_internal(
         self,
-        error_code: ErrorCodes,
+        error_code: ErrorCodesBase,
         exception: Exception | None = None,
     ):
         """Handles internal troubleshooting.
diff --git a/tests/test_actor.py b/tests/test_actor.py
index 04fef42..93695a3 100644
--- a/tests/test_actor.py
+++ b/tests/test_actor.py
@@ -9,7 +9,6 @@
 from __future__ import annotations
 
 import asyncio
-import enum
 import sys
 
 import pytest
@@ -24,28 +23,28 @@
     ErrorCodes,
     ErrorData,
     LVMActor,
-    extend_enum,
-    verify_error_codes,
+    create_error_codes,
 )
 
 
-def test_extend_enum():
-    @extend_enum(ErrorCodes)
-    class ExtraErrorCodes(enum.Enum):
-        SOME_FAILURE_MODE = ErrorData(1, critical=False, description="Test error")
+def test_create_error_codes():
 
-    assert hasattr(ExtraErrorCodes, "SOME_FAILURE_MODE")
-    assert hasattr(ExtraErrorCodes, "UNKNOWN")
+    ErrorCodesTest = create_error_codes(
+        {
+            "CODE1": (1, True),
+            "CODE2": (2, False, "Non-critical error"),
+            "CODE3": ErrorData(3, True, "Critical error"),
+        }
+    )
 
-    assert hasattr(ExtraErrorCodes, "get_error_code")
+    assert "CODE1" in ErrorCodesTest.__members__
+    assert ErrorCodesTest.CODE1.value.code == 1
+    assert ErrorCodesTest.CODE1.value.critical
 
+    assert ErrorCodesTest.CODE2.value.code == 2
+    assert ErrorCodesTest.CODE2.value.critical is False
 
-def test_verify_error_codes_fails():
-    with pytest.raises(ValueError):
-
-        @verify_error_codes()
-        class NewErrorCodes(enum.Enum):
-            SOME_FAILURE_MODE = 1
+    assert ErrorCodesTest.CODE3.value.code == 3
 
 
 async def test_command_actor_state(lvm_actor: LVMActor):