diff --git a/aiida/engine/processes/exit_code.py b/aiida/engine/processes/exit_code.py
index de660ed5dd..0c54a5be72 100644
--- a/aiida/engine/processes/exit_code.py
+++ b/aiida/engine/processes/exit_code.py
@@ -48,9 +48,6 @@ def format(self, **kwargs):
 
         return ExitCode(self.status, message, self.invalidates_cache)
 
-    def __eq__(self, other):
-        return all(getattr(self, attr) == getattr(other, attr) for attr in ['status', 'message', 'invalidates_cache'])
-
 
 # Set the defaults for the `ExitCode` attributes
 ExitCode.__new__.__defaults__ = (0, None, False)
diff --git a/tests/engine/processes/text_exit_code.py b/tests/engine/processes/text_exit_code.py
index 2371d7fb2b..2672a11285 100644
--- a/tests/engine/processes/text_exit_code.py
+++ b/tests/engine/processes/text_exit_code.py
@@ -33,6 +33,18 @@ def test_exit_code_construct():
     assert exit_code.invalidates_cache == invalidates_cache
 
 
+def test_exit_code_serializability():
+    """Test that an `ExitCode` instance can be serialized and deserialized with `yaml`."""
+    import yaml
+
+    exit_code = ExitCode()
+    serialized = yaml.dump(exit_code)
+    deserialized = yaml.full_load(serialized)
+
+    assert deserialized == exit_code
+    assert isinstance(deserialized, ExitCode)
+
+
 def test_exit_code_equality():
     """Test that the equality operator works properly."""
     exit_code_origin = ExitCode(1, 'message', True)
@@ -42,6 +54,24 @@ def test_exit_code_equality():
     assert exit_code_origin == exit_code_clone
     assert exit_code_clone != exit_code_different
 
+    # Check default `ExitCode` also matches normal tuples
+    exit_code = ExitCode()
+    assert exit_code == (0, None, False)
+
+    assert exit_code != {}
+    assert exit_code != []
+    assert exit_code != ()
+    assert exit_code != (0)
+    assert exit_code != (None,)
+    assert exit_code != (0, None)
+    assert exit_code != [0, None, False]
+    assert exit_code != [0, None, False, 'test']
+
+    # `ExitCode` instances should match bare tuples as long as the content is the same
+    exit_code = ExitCode(1, 'message', True)
+    assert exit_code == (1, 'message', True)
+    assert exit_code != ()
+
 
 def test_exit_code_template_message():
     """Test that an exit code with a templated message can be called to replace the parameters."""