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Thread: Air conditioner vibrating thru the ceiling

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    Senior Member bigdob24's Avatar
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    Air conditioner vibrating thru the ceiling

    I have a 2018 BC 3560SS and lately the bedroom air has a bad vibration.
    I have removed the fresh air vent covers and pressed around there with no results and also held a rod thru the air vents and no vibration there either.
    So it has to be in or under the air unit.
    Maybe someone has had this problem and can give some advise before I remove the cover .
    Thanks
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    Moderator cookie's Avatar
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    Re: Air conditioner vibrating thru the ceiling

    It seems that when there is an annoying vibration it's a sign that the fan is out of balance.
    Could be caused by an insect nest on one of the blades.
    I suggest pulling the cover off and inspecting the fan blades along with everything else up there.

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    Senior Member bigdob24's Avatar
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    Re: Air conditioner vibrating thru the ceiling

    Ill have a look
    Thanks
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    Moderator danemayer's Avatar
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    Re: Air conditioner vibrating thru the ceiling

    When getting ready to remove the cover, assume a hornet nest is waiting for you. It might not be there, but you don't want to jump back and fall off the roof.


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    Re: Air conditioner vibrating thru the ceiling

    Quote Originally Posted by cookie View Post
    It seems that when there is an annoying vibration it's a sign that the fan is out of balance.
    Could be caused by an insect nest on one of the blades.
    I suggest pulling the cover off and inspecting the fan blades along with everything else up there.

    Peace
    Dave
    Exactly what it is. Get the water hose out and give it a bath.
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    Re: Air conditioner vibrating thru the ceiling

    hopefully it is only a piece of debris that has fallen into the fan and causing it to be out of balance... but if the circuit isnt allowing enough power thru to allow the motor to get out of start up mode, it will vibrate and rumble like crazy until you shut it off.... in addition, this condition would be extremely harmful to the AC unit
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    Senior Member wdk450's Avatar
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    Re: Air conditioner vibrating thru the ceiling

    You might also make sure that the 4 corner mounting bolts are snug (not overly tight, though).

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    Senior Member bigdob24's Avatar
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    Re: Air conditioner vibrating thru the ceiling

    Quote Originally Posted by Flick View Post
    Exactly what it is. Get the water hose out and give it a bath.
    After turning off the power, how do you go about safely giving your air conditioner a bath?
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    Senior Member Flick's Avatar
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    Re: Air conditioner vibrating thru the ceiling

    Quote Originally Posted by bigdob24 View Post
    After turning off the power, how do you go about safely giving your air conditioner a bath?
    Its pretty simple. With the power off as you said, go up on the roof and remove the ac cover or shroud. There will be 4 screws holding it on. The likely culprit is a mud dauber that has built a mud nest on one of the blades. Look close. The mud could be on the back side of the blade. If you turn the fan by hand, the nest will usually carry the mud nest to the bottom. Then take a water hose and rinse the entire ac unit to wash away the mud. Try not to get to much water into the electric components, but it wont hurt if some gets in there. Also wash out the condenser.

    Some water may drip down into the inside, so if its over a bed, protect the area with a towel or two.
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    Senior Member centerline's Avatar
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    Re: Air conditioner vibrating thru the ceiling

    Quote Originally Posted by Flick View Post
    Its pretty simple. With the power off as you said, go up on the roof and remove the ac cover or shroud. There will be 4 screws holding it on. The likely culprit is a mud dauber that has built a mud nest on one of the blades. Look close. The mud could be on the back side of the blade. If you turn the fan by hand, the nest will usually carry the mud nest to the bottom. Then take a water hose and rinse the entire ac unit to wash away the mud. Try not to get to much water into the electric components, but it wont hurt if some gets in there. Also wash out the condenser.

    Some water may drip down into the inside, so if its over a bed, protect the area with a towel or two.
    additionally, be very careful about spraying the cooling fins with the water hose, as the pressure may bend them over, preventing any cooling effect in that spot. and its a real pain using a toothpick to straighten them out again... if you dont have a fin straightener tool.
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