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Re: fan blades rub on housing
The fan is not level.
You will have to relevel the fan. One "trick" we use until a fan can be releveled is to stick a wieght on the top side of the blade. You will have to find which blade will weight back to level. Usually the one on the oposite side of the one that rubs. Tape some quarters or fishing weights on the top side and keep adding until it quits.
Once you get a chance to relevel it get yourself a foot long level and loosen the connections and redo the mountings.
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Since you didn't leave a model number, I will have to give you a generic answer, instead of one with a part number of the most likely replacement part. Normlly the problem you discribe is a result of the blower motor bearing wearing out and letting the fan blades rub against the housing. And since the bearing is internal to the motor, you have to replace the entire motor.
Fan should not be rubbing up against anything. I don't think the fan is secured properly to the motor shaft. Tighten down the metal clip that holds the fan onto the shaft. Make sure it's not back too far.
Problem 1. Fan will not start. Probable Cause 1. Fuse or circuit breaker blown. 2. Loose power line connections to the fan, or loose wire connections in the switch housing. 3. Reversing switch in neutral position.
Suggested Remedy 1. Check main and branch circuit fuses or circuit breakers. 2. Check line wire connections to fan and switch wire connections in the switch housing. 3. Make sure reversing switch position is all the way to one side.
WARNING: Make sure main power is turned off.
Problem 2. Fan sounds noisy. Probable Cause 1. Blades not attached to fan. 2. Loose screws in motor housing. 3. Screws securing fan blade flanges to motor hub are loose. 4. Switch housing binding against the blade hub. 5. Wire connectors inside switch housing rattling. 6. Screws holding blades to flanges are loose.
Suggested Remedy 1. Attach blades to fan before operating. 2. Check to make sure all screws in motor housing are snug (not over-tight). 3. Check to make sure the screws which attach the fan flanges to the motor hub are tight. 4. Check to make sure that the switch housing does not bind against the blade hub. 5. Check to make sure wire connectors in switch housing are not rattling against each other or against the interior wall of the witch housing. 6. Tighten screws securely.
WARNING: Make sure main power is turned off.
Problem 3. Fan wobbles Probable Cause 1. Setscrew in motor coupling is loose. 2. Setscrew in the hanger ball/downrod assembly is loose. 3. Screws securing fan blade flanges to motor hub are loose. 4. Fan blade flanges not seated properly. 5. Hanger bracket and/or outlet box is not securely fastened. 6. Fan blades could be out of balance.
Suggested Remedy 1. Tighten the setscrew in the motor coupling. 2. Tighten the setscrew in the hanger ball/downrod assembly. 3. Check to be sure screws which attach the fan blade to motor hub are tight. 4. Check to be sure the fan blade flanges seat firmly and uniformly to the surface of the motor hub. If flanges are seated incorrectly, loosen the flange screws and retighten. 5. Tighten the hanger bracket screws to the outlet box, and/or secure outlet box. 6. Interchanging an adjacent (side-by-side) blade pair can redistribute the weight and result in smoother operation.
WARNING: FOR YOUR OWN SAFETY TURN OFF POWER AT FUSE BOX OR CIRCUIT BREAKER BEFORE TROUBLESHOOTING YOUR FAN!!!
Hi. You didn't state which fan you are having issues with, so i will address both areas.
The condenser fan is located behind the refrigerator. It may be necessary to remove an access panel to reach it. This fan has a shroud, and if the fan blade becomes warped, it will rub against the shroud, causing noise. This fan blade is whole,and it can be removed and replaced if this is the case. Ok, the next problem spot will be the evaporator fan.
The evaporator fan is located at the back of the freezer. It may be necessary to remove obstructions such as the contents of the freezer, freezer shelves, ice maker and the rear inside panel of the freezer. The rear panel may be held in place by retainer clips or screws. Remove the screws or depress the retainer clips with a small screwdriver. Check the fan for warped blades. If the blades are warped or mis-aligned, replace it. This fan also is protected by a shroud as well, and it will make noise if the fan blade is damaged.
NOTE_ If the fan blades are not warped, and rubbing against the shrouds, this will indicate that the motor that rotate the affected fan is damaged. It must be replaced, in this case.
most likly the fault is the fan blades touching the side of the
circular hole,to test.1.switch of all power.2.when power is switched of
try switching your oven to on position.if oven will not work then
proceed3.if you can turn the fan blades by useing a thin piece of wood
or simler.4 if when you turn the blades you hear a rubbing noise you
might take a closer look if you have torch point it in if you see the
blades touching or one of the blades touching it might be possable to
to push the offending blade back very slightley useing the same piece
of wood you yoused at 3.if this fails to solve your problem the fan
moter might be ready to give up. I hope this can solve your
In the lower portion of the furnace you'll see where the blower housing is hung in the center of the furnace. There are two bolts you'll need to remove to pull out the whole housing. Depending on the size furnace you have you may have to unmount the control board and set it aside. Don't worry there is no need to remove the wires from the board. Once you have the housing out set it on its side (motor side down) and you'll see a shaft where the blower wheel mounts onto the motor shaft. There should be a bolt you can tighten. first loosen the bolt and put the housing right side up. after that center the wheel on the shaft so that neither of the sides of the wheel are rubbing on the housing once you find that spot where the wheel spins without rubbing tighten that bolt on the shaft and reinstall. should the problem persist you may need to replace the blower housing and/or wheel. I doubt the motor will have to be changed.
In my case noise was coming from the plastic blade rubbing against the sheet metal housing. I removed the motor and added 2 washers to the mounting screws. The washers acted as spacers and lifted up the motor/blade assembly with respect to the sheet metal housing. The blade no longer rubbed against the housing and the noise stopped.