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With the fan UNPLUGGED, try to spin the fan blade with a pencil or something that will fit through the blade cage.
If the blade spins easily, there is an electronic problem (control or motor) that must be serviced.
If the fan blade is stuck or very hard to move, the shaft and bearing are probably dirty and need to be cleaned. You can temporarily fix this with a tiny amount (a drop) of WD-40 applied to the shaft where it enters the motor. Spin the blade manually to work the oil into the bearing. If the motor spins freely, the dirty bearing condition is verified. To properly clean the shaft and bearings, the motor must be disassembled.
I have had good results using a product called Scott's Liquid Gold. It's available in many stores including grocery stores. I started using it to clean up console televisions after repairing them. Make sure you wipe it clean after using it. The residue will attract dust if you don't. It's sort of a "super Pledge"
How do I clean my Cyclone or Air Companion™?
Lay the fan face up on a flat surface. The front grill should be facing you. Remove the screws from the rear grill. Place a flat-head screwdriver into the gap between the front and rear grills. Pull the front grill towards you, exposing the fan blade. Do not remove the knobs on either side. Then, wipe the blade with a soft, damp cloth. Use a mild detergent if necessary. Be sure not to touch the motor. Click here to download product instruction sheet.
go to ur nearest electrical shop and tell them the model and the brand name buy that and fix it but you wont be getting a sigle blade you ll get the blades in a set not as single you need to remove all other blades and fix the new blades
Probably requires cleaning- take the grille off, pull the blade free (most pull straight out- some have a pin/socket deal right behind the blades that need to be removed first) and clean out any gunk you may find inside. Be sure to unplug it first.
before replacing the blade, turn the shaft with your hands to see how it moves; you might want to grease it with an electricity friendly lube of your choice.
If it's still hard to turn, it may just be this fans time; box fans are cheap, and made cheap, and the wear-and-tear adds up.