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Check the blower housing to be sure there are no foreign objects blocking the blower wheel from spinning, also see if you can turn the drum by hand, but don't spin it more than a foot or two as the belt may come off.
the problem may be a failed start/run capacitor for the motor
have a electrician / service technician check it out
the buzzing will be a frequency vibration caused by the motor as it tries to start but with out the extra voltage generated by the capacitor it will not move
usually a "humming motor" indicates either a bad capacitor or a defective motor. With the power off try to spin the blower wheel...it should spin freely. If it is tight or wont spin and there are no obstructions stopping it (like an air filter sucked into blower or other debris) then the motor most likely is seized. If the blower wheel spins free then you may have a bad capacitor. Keep in mind, just because the blower spins easy doesn't mean the motor is good. I have had motors that are defective that dont seize up but most of the time the blower wheel will not spin free if the motor fails.
Does your machine make any noise(humming or slight whine)? If so then something may be seized, try spinning the tub by hand, if it moves then it may then be the motor itself is seized. Test power(with ac 120v meter) at motor, which should be located underneath the machine, just under tub.If you have power right to motor, then it is very likely that it is your motor. If no power to the power, then something in your selector switch has malfunctioned; continue to follow your power supply until you find the short.
It is a faulty start capacitor
This is usually located at the rear of the dryer at the right hand side adjacent to the motor.
Gaining access to it depends on the actual model, but in most cases, removing the right hand side panel will give you access to it
However, on some models it is neccesscery to remove the complete cabinet, this is usually on the smaller models.
try spinning by hand when the unit make the buzzing sound. to see if the capacitor is bad. If the fan runs replace the cap. If not motor probably is bad. See if it spins freely. this is a good starting place. need to check if the buzzing is the contactor and there is no power to the condensor. The contactor will buzz even though the main breaker is off or tripped
Is it spinning the blade at all? If it is then it is unlikely to be an electrical fault. Have you considered a motor bearing fault? If the motor bearings are worn, it could turn freely by hand, but when powered up it would stutter and stall. The motor is basically a big electro-magnet so if the armature has enough lateral movement, when it is magnetized it could rub against the stator.
If the machine is buzzing, but not spinning the blade it is more than likely going to be caused by a faulty capacitor as this is the component that gives the motor the initial 'kick' in the right direction to get it spinning.