At a guess I think that is the problem! He is not an electrician. I did have brief look and then realised that neither am I.
I'm going to suggest that it's probably not wired up right.
They usually need a 3-core and earth cable, fed from a 3-pole fan isolator switch.
The 3 cores are: Perm Live, Switched Live and Neutral. All of these can be sourced from the lighting circuit. From the ceiling rose, in a loop-through system, or the switch wall-box in a neutral-to-the-switches system.
The Perm live is what actually runs the fan motor.
The Switched live is a control input that tells it to start. It will continue to run for a time after the Switched live goes off.