Disable buzzer with command
The button is connected to GPIO0
If you want the light and fan to turn on when you power on your IFan03, use
If you want only the light to turn on when you power up, use
PowerOnState 0 and then
rule1 on power1#boot do backlog fanspeed 0; power1 1 endon
Use the labelled pins on top to flash.
For US (fan speed capacitors) - https://github.com/arendst/Tasmota/issues/5988#issuecomment-515720388