The app should find an engine faster than the remote does when everything is working correctly. The problem is again, the app doesn't tell you exactly what's wrong. You'll get a generic type message like "no TIU found" or something like that. It can be from poor signal, WIFI problems, etc.
I have found that typical PS2 problems stem usually from poor signal or battery issues. At first, it was from the device running the app dropping the MTH WIU for various reasons.
Lately it's from trying to run my different layouts, with just one WIU. I believe that the app gets messed up when I continuously switch to different TIUs controlling different layouts. If I stick with the main O scale 2 rail TIU #1, it's very dependable. If not, I have to reset the app in the device to clear conflicts. If I power down the main TIU, then the devices go back to the house's router by default, and I also have to reset the WIFI settings to MTH when powering back up.
