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Repair guides and support for all household mechanical fans including ceiling, box, tower, and stand fans.

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Box fan makes zingzing sound

My Robeson box fan stopped working, meaning I could hear the motor hum but the blades did not rotate. I removed the blade assembly, cleaned out the dust and oiled the motor. I tested the fan without attaching the blades. The motor seemed to work. After I put the blades back on again, I hear a zing-zing sound. How can I fix this?

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Hi @anupm12

If you hear the motor hum and it does not spin well, I suggest you to check on the fan capacitor first. It should not crack / bloat or leak.

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Augustine, after the cleaning and oiling the motor (with blades removed) does spin properly with no strange noises. When the blades are installed, the motor still spins but I hear a constant zing-zing sound. The capacitor is not cracked, bloated nor leaking.

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Hi @anupm12

With the blades on, when manually spinning them, looking from side on i.e. not from the back or the front, are they turning in a fixed plane or wobbling about due to a bent rotor shaft or faulty bearing that is only noticeable with the weight of the blades on it?

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Jayeff, I don't detect any wobbling.

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@anupm12

Does it make this noise when the fan is outside of the protective cage or only when installed inside it?

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The motor and blades remain within the box (protective cage). I did remove the front and the back grills in order to make repairs.

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@anupm12

So the blades aren't hitting the box at all (side/front) as they turn?

Are the blades all at the same angle away from the centre point?Just wondering if one were at a different angle (twist?) that it may cause the air to make a different sound

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The blades are not hitting anything. One of the blades is twisted when compared to the other two. However the zingzing sound is metallic and not a swish of the air sound.

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