Unstable ceiling fan

I have a bunch of ceiling fans in my house but one is very unstable. Whenever it's turned on, the blades rotate fine but the whole fan itself begins wobbling. It's looks pretty unstable and I'm afraid to have it on (above my son's bed).

I've tried tightening all the screws on it but that didn't seem to help, in fact none were loose. It's almost as if the blade weights are not equal, causing it to wobble....but, the fan used to work fine!

Any help would be appreciated. Thanks.

Erling

 

First, make sure that the box that the fan is mounted to is not loose and that the fan mounting bracket screws are tight in the box also. Also make sure that the screws which secure the downrod are tight.

Any chance that 1 of the blade got bent ? With the fan off and using a yardstick or tape measure, measure the distance straight down from the ceiling to the tip of 1 blade.Leaving the yardstick in the same place, rotate the fan to the next blade and see if it measures the same. Repeat this procedure for each blade and bend the brackets accordingly until they all measure the same distance from the ceiling. If this doesn't solve it, there are blade balancing kits available that come with a weights that you experiment with trying them on different blade until the fan stops wobbling. ( This can also be done by taping a coin to the top of a blade ) There are instructions that come with the kit.

 

Blades can warp with humidity changes. As long as this fan is mounted to a fan-rated box in the ceiling, and as long as the box is securely attached to a framing member, the fan is not likely to fall.

So just rebalance the blades as tex instructed. You may need to do it again later if it starts to wobble again some time in the future.

Just curious, but what brand of fans are these?

 

Check to make sure that the blades are clean. The uneven accumulation of dust will cause the problem that you describe.