Do I need an Isolation Switch?

YES.

Aeratron strongly recommends the use of Isolation Switches, when installing your Ceiling Fan, especially for dwellings with more than one Aeratron Ceiling Fan installed.

The reason for this is, in the event you need to reprogram your fan you can do it yourself.

If Isolation Switches are not installed an electrician will need to be called out to reprogram the ceiling fan(s) if there is more than 1 in the dwelling.