Trouble Shooting
It seems that most of the situations where you can face "No response" in Home app are due to networking issues.
Some routers and access points allow the usage of a single SSID name for both 2.4Ghz and 5Ghz. This can create some issues and it's recommended that you keep separate networks for 2.4Ghz and 5Ghz with different SSIDs.
If you want to read more about this, please look into issue #215
If you have an unmanaged switch this might be the problem, since they probably are not handling multicast / MDNS very well. You can try to replace your switch with a managed one where you can tweak these settings.
If you want to read more about this, please look into issue #215