Lyric T5 does not respond to commands via Apple Homekit

Question

I have a friend who has a Lyric T5 Wi-Fi thermostat which he was controlling from his iPhone via Apple Homekit. Recently, all commands from his phone stopped reaching his device, demonstrating that they were no longer connecting to each other. Why would this be happening and how could he fix it?

Answer 1

Okay, turns out he found the solution here:

If your commands are not responding, it means there is a disconnect between the app and Apple HomeKit. To resolve this use the following steps:

• Go into Settings on your smartphone and select the Wi-Fi, then scroll down to see thermostat name with the last six digits of the MAC ID .
• Turn Home Data off.
• Uninstall and reinstall the Lyric app.
• Go back into Settings and turn Home Data back on.
• Make sure that your iOS version is up-to-date.

Apparently, doing this fixed his problem up entirely.