How to fix a fan that hums
When your fan makes a humming noise, you may be able to eliminate this by changing the control, unless the fan motor is broken. Be sure to buy a control that has an anti-hum feature; the amperage rating must be equal to or greater than the demands of your fan. Multiple fans or fans with lights might require special controls.
- Turn off the power to the fan at the circuit breaker.
- Check the fan’s switch to make sure it’s off.
- Remove the face plate and switch. Use a voltage tester to be sure the wires connected to the fan switch are not “hot.”
- Disconnect the wires from the switch.
- Add wire nuts, screw the control to the electrical box, reattach the face plate, and restore the power.
How to fix a fan that wobbles
In many cases, wobble happens when a fan has been hung from a regular ceiling electrical box instead of an electrical box rated for fans. Because of its weight and constant movement, a fan exerts more force on the box than does a light.
- Unscrew and lower the bracket housing at the ceiling. Check the electrical box for a label that shows it as a fan-rated box. U-bolts or lag screws should connect the metal box to a bracket or solid wood block in the attic.
- Check the fan’s support. If the fan hangs from the wrong type of box or is under-supported, call an electrician. If you can’t determine the type of support, you may have to climb into the attic, but before you do follow the next steps.
- Wiggle the support bracket. If it isn’t firm, tighten it.
- Check the drop rod. If your fan hangs from a drop rod, be sure the ball joint at the top of the drop rod is properly engaged with the bracket.
- Check and, if necessary, tighten all bolts and screws.
- Measure to see if the blade tips hang an even distance from the ceiling. If they don’t, one or more of the blades may be bent or warped. Report this to the manufacturer; most offer replacement blades.