diff --git a/pytec/pytec/gui/model/thermostat.py b/pytec/pytec/gui/model/thermostat.py
index 42b24f8..042ba4e 100644
--- a/pytec/pytec/gui/model/thermostat.py
+++ b/pytec/pytec/gui/model/thermostat.py
@@ -39,10 +39,9 @@ class Thermostat(QObject, metaclass=PropertyMeta):
     async def start_session(self, host, port):
         self.connection_state_changed.emit(ThermostatConnectionState.CONNECTING)
         await self._client.connect(host, port)
-        hw_rev_data = await self.get_hw_rev()
+        await self.get_hw_rev()
         self.connection_state_changed.emit(ThermostatConnectionState.CONNECTED)
         self.start_watching()
-        return hw_rev_data
 
     async def run(self):
         self._update_params_task = asyncio.create_task(self.update_params())
diff --git a/pytec/pytec/gui/view/thermostat_ctrl_menu.py b/pytec/pytec/gui/view/thermostat_ctrl_menu.py
index 6a14597..247bd13 100644
--- a/pytec/pytec/gui/view/thermostat_ctrl_menu.py
+++ b/pytec/pytec/gui/view/thermostat_ctrl_menu.py
@@ -138,8 +138,6 @@ class ThermostatCtrlMenu(QtWidgets.QMenu):
             )
         with QSignalBlocker(self.fan_auto_box):
             self.fan_auto_box.setChecked(fan_settings["auto_mode"])
-        if not self.hw_rev_data["settings"]["fan_pwm_recommended"]:
-            self.set_fan_pwm_warning()
 
     def set_fan_pwm_warning(self):
         if self.fan_power_slider.value() != 100:
diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index 37ec630..4dd8dca 100755
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -58,7 +58,6 @@ class MainWindow(QtWidgets.QMainWindow):
         ui_file_path = importlib.resources.files("pytec.gui.view").joinpath("tec_qt.ui")
         uic.loadUi(ui_file_path, self)
 
-        self.hw_rev_data = None
         self.info_box = InfoBox()
 
         self.thermostat = Thermostat(self, self.report_refresh_spin.value())
@@ -220,7 +219,7 @@ class MainWindow(QtWidgets.QMainWindow):
                 )
             )
             try:
-                self.hw_rev_data = await self._connecting_task
+                await self._connecting_task
             except (OSError, asyncio.CancelledError) as exc:
                 await self.thermostat.end_session()
                 if isinstance(exc, asyncio.CancelledError):