Greetings, I hope this forum can be of some use to me. We shall see.
House was built in the 1990's.
We are the third owner's. Purchased home in Oct. '10
Our bedroom has one switch which controls a room fan.
Fan operates just fine. We can use the pull strings for fan or fan light with no problem.
Today, with the fan turned on my wife heard a very loud humming sound. It seemed like it was coming from the opposite wall of the switch. Sure enough I determined that the attic fan is being controlled by the room fan as well.
The biggest concern is that we have never heard the attic fan kick on when we switch the room fan to the on position.
A) Is this wiring setup allowed?
B) What would explain the attic fan turning on now? (Current temp. at time of discovering this issue is 100 degrees. There have been hotter days and we have not heard the attic fan run.)
C) If this is not legitimate wiring, could the room fan switch be changed to a dual switch as long as the amps are not exceeded for the line? (I have not gone into the attic yet to find the fan amp rating, nor have I determined what is on this entire run.)
It possibly could be caused by someone who installed a ceiling fan in your bedroom used the attic fan switch as a way to power the ceiling fan in the bedroom and wired it wrong at the switch of the attic fan.