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Hi all I need your help my old vent Axia went busted and i needed a new one . I bought the same model VA100 and wire it up . That where the problem begin, on the terminal block on the vent got L. N SL so I conect the blue cable to the N terminal the Brown to the L terminal and the black to the SL terminal . When I switch on the FCU the vent works But can't control it from the light switch. It's looks like the FCU totally bypassed the light switch . On the circuit diagram on the vent there are isolator switch and pull cord which I don't have . What am I doing wrong ? How can I wire it so that the FCU is ON but the Light Switch control on and on ? At the moment it's permanently on which I don't want . Please help