diff --git a/pytec/pytec/gui/model/pid_autotuner.py b/pytec/pytec/gui/model/pid_autotuner.py
index cfa2b96..ef26246 100644
--- a/pytec/pytec/gui/model/pid_autotuner.py
+++ b/pytec/pytec/gui/model/pid_autotuner.py
@@ -37,7 +37,7 @@ class PIDAutoTuner(QObject):
 
     async def stop_pid_from_running(self, ch):
         self.autotuners[ch].setOff()
-        await self.thermostat.set_param("pwm", ch, "i_set", 0)
+        await self._thermostat.set_param("pwm", ch, "i_set", 0)
 
     @asyncSlot(list)
     async def tick(self, report):
@@ -56,21 +56,21 @@ class PIDAutoTuner(QObject):
                     self.autotuners[ch].run(
                         channel_report["temperature"], channel_report["time"]
                     )
-                    await self.thermostat.set_param(
+                    await self._thermostat.set_param(
                         "pwm", ch, "i_set", self.autotuners[ch].output()
                     )
                 case PIDAutotuneState.STATE_SUCCEEDED:
                     kp, ki, kd = self.autotuners[ch].get_tec_pid()
                     self.autotuners[ch].setOff()
 
-                    await self.thermostat.set_param("pid", ch, "kp", kp)
-                    await self.thermostat.set_param("pid", ch, "ki", ki)
-                    await self.thermostat.set_param("pid", ch, "kd", kd)
-                    await self.thermostat.set_param("pwm", ch, "pid")
+                    await self._thermostat.set_param("pid", ch, "kp", kp)
+                    await self._thermostat.set_param("pid", ch, "ki", ki)
+                    await self._thermostat.set_param("pid", ch, "kd", kd)
+                    await self._thermostat.set_param("pwm", ch, "pid")
 
-                    await self.thermostat.set_param(
+                    await self._thermostat.set_param(
                         "pid", ch, "target", self.target_temp[ch]
                     )
                 case PIDAutotuneState.STATE_FAILED:
                     self.autotuners[ch].setOff()
-                    await self.thermostat.set_param("pwm", ch, "i_set", 0)
+                    await self._thermostat.set_param("pwm", ch, "i_set", 0)