No need for async

pytec/tec_qt.py

@@ -15,6 +15,7 @@ import asyncio
 import logging
 import argparse
 from PyQt6 import QtWidgets, QtGui, uic
+from PyQt6.QtCore import pyqtSlot
 import importlib.resources
 
 
@@ -72,8 +73,8 @@ class MainWindow(QtWidgets.QMainWindow):
                     await self.autotuners.stop_pid_from_running(ch)
         self.thermostat.disconnect_cb = autotune_disconnect
 
-        @asyncSlot()
-        async def handle_connection_error():
+        @pyqtSlot()
+        def handle_connection_error():
             self.info_box.display_info_box(
                 "Connection Error", "Thermostat connection lost. Is it unplugged?"
             )