Hi! I understand your American Standard Home app has been functioning well but now it won't open or load, even though your phone and thermostat are connected to Wi-Fi. Let's work through this together.

First, just to get some details—when you try to open the app, does it crash immediately, stay stuck on a loading screen, or show any error messages?

While you check that, here are some common troubleshooting steps you can try:

1. Restart Your Phone: A simple reboot can often clear temporary app or network glitches.

2. Check for App Updates: Visit your phone's app store and confirm the American Standard Home app is up to date. Developers release updates to fix bugs that might cause loading issues.

3. Force Close the App and Reopen: On your phone, go to the app switcher, swipe the American Standard Home app away to close it completely, then try reopening.

4. Clear App Cache and Data (if possible): Sometimes corrupt cache data can block app loading. Depending on your phone, you can clear the app cache under the phone settings > Apps > American Standard Home > Storage.

5. Confirm Network Access for the App: Ensure the app has permission to use Wi-Fi/mobile data. Also, test other apps to make sure your internet connection is stable.

6. Check Thermostat Connection: Even if the thermostat shows connected to Wi-Fi, the app might require re-enrollment. Sometimes un-enrolling and then re-enrolling the thermostat in the app solves connectivity issues1.

If the app still won’t open after trying these, it’s useful to uninstall the app and reinstall it—this often resets app components that may have failed.

Please try these and let me know what you observe—does the app open at all, or does it remain stuck on some screen? That way, I can guide you on more specific actions like checking thermostat firmware or your network settings.