If you have not connected your fan to the app, check the Wi-Fi settings on your mobile device to see if the fan’s default network is broadcasting. If you see the network, set up the Modern forms app and add your fan. (here links to another FAQ)
iOS devices & Android: The Modern Forms Smart fan network will take the format ModernFormsFan_AA:BB:CC.
If you already connected your fan to the app, it may have temporarily lost its network connection. Try each of the following, one at a time:
Power cycle: Turn off power to the fan for one minute using the wall control emergency On/Off switch or circuit breaker, and then restore power.
Network reset: See How to reset my fan’s network settings. (here links to another FAQ)