I recently bought a new house where the bedrooms were prewired for
ceiling fans with separate switches for the light and fan. I installed
a fan in one room with no problems, however the second room has an odd
problem. When I turn just the fan on (at the wall), the fan runs fine.
When I turn the light on (at the wall), the light comes on but the fan
turns off. If I turn the light back off, the fan starts up again.
I checked my wiring as follows:
Previously there was just a light fixture that operated on the White
and Brown wires. It seems like it would be something with how things
are wired at the wall switches but I'm not really sure what.
Your problem is at the switch side. You should have two, single pole
switches- The power supply(hot) should go to both of them and one should
have the black going to the fan and the other should have the brown going to
I pulled the switches out of the switch box and looked at the wiring.
Both switches are regular single switches. They are wired a bit
differently than you stated. All the hot (White) are tied together.
The Black from the fan goes to one switch and the Brown for the light
goes to the other switch. Both switches then have a Black that ties
into the rest of the black in the box. Sounds similar to what you
mentioned but instead of putting hot on both switches it is neutral.
Other suggestions? Thanks for your assistance.
OK, there's a problem: you don't have the concept right. White is neutral.
Black is hot.
No, the switch is on the hot where it belongs. Unless somebody wired the
circuit backward, that is.
Well, if the switches are actually standard switches as you say, and the
switches and the unit are wired as you describe, and the unit behaves as you
describe... something very, very strange is going on. Are you *sure* your
description is accurate?
Doug Miller (alphageek at milmac dot com)
Nobody ever left footprints in the sands of time by sitting on his butt.
And who wants to leave buttprints in the sands of time?
It sounds from what you describe it is wired correctly in the
Try this test. At the light fixture, disconnect all the wiring. Find a
constant 110V feed at the light and try each the fan and the light
seperately. If it works, it sounds like the problem is from the light
fixture to the switchbox. Otherwise it could be a problem with the fan.
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