diff --git a/frappy/mixins.py b/frappy/mixins.py
index 29456045..c353ad40 100644
--- a/frappy/mixins.py
+++ b/frappy/mixins.py
@@ -65,7 +65,7 @@ class HasOutputModule(Writable):
     """
     # mandatory=False: it should be possible to configure a module with fixed control
     output_module = Attached(HasControlledBy, mandatory=False)
-    control_active = Parameter('control mode', BoolType())
+    control_active = Parameter('control mode', BoolType(), default=False)
 
     def initModule(self):
         super().initModule()
diff --git a/frappy_psi/convergence.py b/frappy_psi/convergence.py
index f7820ea0..0a34a955 100644
--- a/frappy_psi/convergence.py
+++ b/frappy_psi/convergence.py
@@ -21,10 +21,11 @@
 # *****************************************************************************
 
 from frappy.core import Parameter, FloatRange, BUSY, IDLE, WARN
+from frappy.states import HasStates
 from frappy.lib.statemachine import StateMachine, Retry, Stop
 
 
-class HasConvergence:
+class HasConvergence(HasStates):
     """mixin for convergence checks
 
     Implementation based on tolerance, settling time and timeout.