Hi... can anyone please help... I have a casabranca zephyr (1980-1990) ceiling fan with a w-11 switch. It may be wired wrong... or it may be defective?. there are 2 wires coming out the back... a black and a twisted black and white. The black Is wired to a black wire in the box, and the black/white is nutted with 3 other black wires. Only the power button works, and it only turns the lights on... fan does not respond at all.. neither the fan nor the light buttons turn anything on. Thanks!

Was it working correctly not long ago?