I don’t remember specifically ever doing it but I’m pretty sure that I’ve used all of the speeds via alexa and I don’t remember ever noticing any problems.
Medium is flaky at best.
You can use “Alexa “Set Fan Name” to Speed 1” through Speed 3.
Works much better than low, medium or high.
With the last few updates from HA (im running core-2021.3.2) the changes to the fan break the HAC fan row addon. Anyone able to fix or find a work around? I am not knowledgeable enough to code it.
I tried to put the iFan03 into auto discovery (tasmota setoption19) but it doesnt work well. HA would see the fan and give me three four buttons (1 for light and 3 for fan relays). The relay control button just off after a second of being turn on and there is no way to turn the fan off.
Hope someone can figure this out.
EDIT: fix can be found here 2021.03 and tasmotized Sonoff IFan03 - lots of errors in log and fan unavailable - Configuration - Home Assistant Community (home-assistant.io)