To resolve issues with your HEOS app, follow these detailed steps:

1. Check Network Connectivity
Ensure that your device running the HEOS app is connected to the same WiFi network as your HEOS system. Compatibility issues often arise if they are on different networks - learn more.

2. Verify UPnP Settings
If you recently updated the HEOS app and are experiencing control problems, check that UPnP (Universal Plug and Play) is enabled on your network router. This setting is crucial for allowing devices to discover each other on the network - learn more.

3. Power Cycle Your Devices
Disconnect the power from your HEOS device for about 30 seconds, then reconnect it. This can resolve temporary glitches - learn more.

4. Update Firmware
Make sure both the HEOS app and the HEOS device firmware are up to date. You might also need to install the Denon AVR app for full functionality - learn more.

5. Reinstall the App
If problems persist, consider uninstalling and reinstalling the HEOS app on your device. This can clear cached data and resolve issues that could affect performance - learn more.

6. Check for Physical Obstructions
Ensure there are no physical obstructions between your HEOS devices and the router that could weaken the WiFi signal. Bringing your HEOS devices closer to the router can sometimes help - learn more.

7. Restart Your Router
Sometimes, simply restarting your WiFi router can help resolve connectivity issues that may affect the HEOS app.

By following these steps, you should be able to troubleshoot and resolve the issues preventing you from using your HEOS app effectively. If the problem continues, consider reaching out to Denon support for further assistance.