wierd lighting problem

[ian00uk]

a friend of mine has a problem in his house. in room 1 there is a ceiling rose with a 1 way switch. In room 2 there is a ceiling rose with a dimmer switch. when you use the dimmer switch in room 2 to make it brighter, the light in room 1 dims lower and vice verser. when the light is off in room 2 the light in room 1 is on but if you were to turn room 2 light on with the dimmer the light in room 1 will go off.
im thinking its a faulty dimmer switch as its quite noisy and looks like its seen better days.
any help would be great
thanks

 

[mayfair]

Think someone has got their wires crossed room one is being fed of room two at a guess

 

[bugsy]

Wiring connections at room 1 ceiling rose

 

[martysparky]

switched sister

 

[ian00uk]

what does that mean switched sister?

thanks

 

[GStueyXR]

Tell him to call a local qualified electrician.