diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index 2069c37..53a0e0f 100644
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -133,6 +133,7 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
         self.fan_power_slider.setEnabled(not enabled)
         if enabled:
             await self.tec_client.set_param("fan", "auto")
+            self.fan_update(await self.tec_client.fan())
         else:
             await self.tec_client.set_param("fan", self.fan_power_slider.value())