3 GANG DIMMER

[SAM1]

Dimmer 1 and 2 working. 3 not working.
Wiring diagram as follows:

2 cables coming into the box.

Switch 1 feeds two spotlights
Switch 2 feeds two spotlights
Switch 3 feeds four spotlights

Switch 1 (Working) yellow wire connected (red wire jumped from switch 2)

Switch 2 (Working) blue wire connected with red wire connected and jumped to Switch 1

Switch 3 (Not working) appears to be new cable colours
Brown wire and grey connected. Black wire hanging loose.

ANY IDEAS PSE

 

[jj4091]

If the brown & grey are connected together in one terminal on switch 3 & you have not altered anything, then it would appear that the black has come out of the second terminal on switch 3. Reconnect it the same as switches 1 & 2