We assumed it's like light switches, since that is the same style they used on our 2009. Push on the top and it's ON, Push on the bottom for OFF.
So far 3 winters and no issues using that logic.
2014 Mobile Suite Estates 38RSB - custom home
2014 F450 KR CC 4x4 ...... his office
2015 Lance 1172 - traveling Motel (solar and generator)
Working Fulltimers since 3/2005