Jas:
JK> I installed a ceiling fan in my master bed room last night. IT works JK> fine when the ac is off and it is smooth and quiet at all speeds. JK> JK> HOwever whenever the fan is on medium speed and the ac is on, there JK> are sporadic vibration which are not severe but enough to make the JK> metal fan power cord hit the light fixture to create a "cling" sound. JK> Kinda distracting when trying to get some sleep.
Possible fan blade balance problem? Go to the far side of the room and look at the rotating blades. Are they even or does it look like they're going up and down? Refer to the installation manual as to how to fix.
Another possibility is a slightly loose ceiling mount: the junction box may be loose.
If the balance vibration is minimal I would probably just do something to keep the cord from hitting the light fixture -- reposition the cord.
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