I have wired up my blue series fan switch using Line, Load, Neutral, Gnd to a multi speed ceiling fan.
Problem: The fan only works at high speed when it should work at all speeds.
I ensured:
Neutral connected. Shows as such in the power state.
Switch type set to ceiling fan (3 speed).
It previously worked at all speeds but the catch is this ceiling fan used a Lutron SFS-5E fully variable dimmer. It has a smooth slider where I can set the fan to any speed.