diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index c29ebb6..b022e45 100644
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -266,29 +266,32 @@ class MainWindow(QtWidgets.QMainWindow):
 
         for inner_param, change, data in changes:
             if change == "value":
-                if inner_param.opts.get("param", None) is not None:
+                new_value = data
+                if "thermostat:set_param" in inner_param.opts:
+                    thermostat_param = inner_param.opts["thermostat:set_param"]
+
                     if inner_param.opts.get("title", None).endswith(" (mA)"):
-                        data /= 1000  # Given in mA
+                        new_value /= 1000  # Given in mA
 
                     thermostat_param = inner_param.opts["param"]
                     if thermostat_param[1] == "ch":
                         thermostat_param[1] = ch
 
-                    if inner_param.name() == "rate" and data is None:
+                    if inner_param.name() == "rate" and new_value is None:
                         set_param_args = (*thermostat_param[:2], "off")
                     else:
-                        set_param_args = (*thermostat_param, data)
-                    param.child(*param.childPath(inner_param)).setOpts(lock=True)
+                        set_param_args = (*thermostat_param, new_value)
+                    inner_param.setOpts(lock=True)
                     await self.client.set_param(*set_param_args)
-                    param.child(*param.childPath(inner_param)).setOpts(lock=False)
+                    inner_param.setOpts(lock=False)
 
-                if inner_param.opts.get("pid_autotune", None) is not None:
+                if "pid_autotune" in inner_param.opts:
                     autotuner_param = inner_param.opts["pid_autotune"][0]
                     if inner_param.opts["pid_autotune"][1] != "ch":
                         ch = inner_param.opts["pid_autotune"][1]
                     self.autotuners.set_params(autotuner_param, ch, data)
 
-                if inner_param.opts.get("activaters", None) is not None:
+                if "activaters" in inner_param.opts:
                     activater = inner_param.opts["activaters"][
                         inner_param.reverse[0].index(data)  # ListParameter.reverse = list of codename values
                     ]