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Fan motor probably went bad...You can try to see if the motor is seized up by taking the cover off and giving the fan a little spin. Make sure you unplug the unit first...If the fan spins by hand but does'nt turn when on then the windings in the motor have burnt up..you can obtain a fan motor from any appliance parts dealer. A word of cautin though...there are VERY lethal voltages present inside especially on the magnetron tube and the big silver filter capacitor inside...DO NOT touch these components as they have the ability to KILL YOU.
I remember happening to us many years ago. The cause was accumulated dirt and loose insulation material interfering with the fan blades. The solution was to unplug the refrigerator from the wall outlet, move the unit to enable reach from the back, unscrew the screws holding the back cover located at the bottom area (made of kind of cardboard), with the vacuum cleaner thin long nose attachment clean anything that looks dirty the best you can reach. Look for the fan and check nothing is interfering with it. Clean it, use a thin brush the best you can. Be careful not to hurt yourself scratching a finger or break anything bumping around cleaning. Some refrigerators design allows to reach the condenser panel (kind of a radiator or grilled looking component), if you can clean that too it will get your unit working efficiency back to maximum.
Another cause for noise could be the freezer fan hitting frozen condensate caused when the door gasket is deteriorated or not sealing well (humidity seeps in and freezes interfering with the fan operation). While you are at it look for any freezer stuff (content) sticking into the freezer fan cover and touching the fan, that may make noise too. Good luck.
Once i opened up the microwave, I found that some kind of capacitor or something (had two wires going to it) had fell down on top of the fan. I had to rig the plastic mounting bracket and re-attach it to a panel inside. That took care of the rubbing noise. It turned out that some one had unplugged the wire that powered the turntable. That took care of that. it seems to work fine now. Steve
It would be unusual for even a Chinese fan to have failed bushings in that short period.
If this unit has a conventional power supply for the magnetron, the noise might be caused by the magnetic field of a large power transformer.
These can have a strong stray field and can cause other sheet metal near them to vibrate.
It isn't dangerous, assuming you don't poke a finger inside, to remove the rear panel and inspect the innards while it is operating. Using something that isn't metal such as a plastic or bakelite spoon (even dampness in a wood utensil can conduct a painful shock), you might try damping the vibration with it.
If you can locate the source, you may be able to kill the resonance by applying a fairly large bead of pure silicone (nothing else) to the surface making the noise.
It it seems to be coming from the transformer itself, I would pull the plug, let the unit sit ignored for a couple of hours (there can be charged capacitors inside) then use a finger to press silicone into the transformer's laminations.
These were once soaked in epoxy in a vacuum container to **** all the air from between the laminations to prevent exactly this kind of 'rattle.'
They probably don't take the time for that any more.
The noise you are hearing is due to the fan. The fan is used to cool the magnetron during cooking, and because this fan is not working the magnetron is overheating and the thermal protector is opening, killing power to the unit. All you need to fix this is a new fan blade. The fan blade(look for part #80) is slipping on the motor shaft ( the noise you are hearing).
Yes, the fan blade is hitting something inside.Usually by opening the microwave, you can slide or reposition the plastic fan blade on the shaft.Probably this happened in shipping to the store where you bought it.CAUTON:make sure the unit is unplugged before you attempt this.Other option is return for replacement.