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Answered. The microwave / convection oven was purchased new in 2011. Everything works properly as far as heating and turning are concerned. However - when it is OFF and the door is closed it hums. The display works, the thermal cut-off is good, the magnetron gives a good reading - the transformer gives me 120v across and the capacitor tests ok.
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First, unplug the microwave from the power. Remove the top cover of the microwave to access the fan and discharge the capacitor. Check the fan blades for damage or obstructions. Check the fan motor for any loose connections or damage. Clean out any dust or debris from the fan blades and motor.
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Possible Causes. It is normal for the unit to produce a humming noise during operation, the noise could be coming from the cooling fan or from the power supply switching the magnetron on and off. The cooling fan helps to cool the enclosed oven cavity and the electronic controls when the oven is in use and/or after the cycle completes.
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1. Place your microwave on a sturdy surface: If your microwave is placed on a shaky or unstable surface, it can vibrate and make a lot of noise. Try to place it on a sturdy surface to reduce the noise. 2. Adjust the feet: The feet of your microwave can be adjusted to level it out and reduce the noise.
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Older and heavy-use microwaves can sometimes develop diode problems. A microwave's diode is responsible for powering the magnetron and converts alternating current to direct current. When your microwave is on, the diode makes a humming noise, but a faulty diode might make crackling sounds when the microwave is off and cooling down.
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To clean it, unplug the microwave and remove the cover. Use a soft cloth and a mild detergent to wipe down the magnetron. 2. Dirty Fan: The fan in your microwave helps to circulate the air and prevent overheating. If it becomes dirty, it can cause a humming noise. To clean it, unplug the microwave and remove the cover.
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A humming microwave can be a sign of a serious issue. When a microwave is humming when it is off, it could be a sign of a problem with the magnetron. The magnetron is the component that creates the microwaves that cook your food. If it becomes damaged or begins to fail, it can cause the microwave to hum even when it is not in use.
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This video provides some troubleshooting information should you hear a humming, thumping or rattling noise coming from your microwave.Humming, thumping, or r.
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Electric hum: The electrical components of the microwave sometimes emit a low humming noise, which is usually not a cause for concern. Mechanical issues: If you hear a loud or unusual noise coming from your microwave when it's off, it could be a sign of mechanical problems. This could be caused by a faulty motor, worn-out bearings, or loose.
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Cooling Fan. If your microwave is making an unusual noise, the problem may be with the cooling fan. The cooling fan is located inside the cabinet and is used to cool the magnetron. Disconnect the power and then remove the cover and locate the fan assembly. Inspect the housing for any foreign objects that may contact the fan blades and then.
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Sometimes, turning your microwave off and giving it a good clean can stop it from making noise. If that doesn't work, the only way to stop your microwave from making noise is to find out which part is faulty and repair or replace it. Occasionally, cleaning the cooling fan can solve the problem if the noise is due to dirt or clogs obstructing.
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These are the most common parts responsible for a noisy microwave: Magnetron - The microwave magnetron uses high-voltage to create the microwave frequency that cooks the food placed in the oven cavity. In good condition, the magnetron will emit a low hum during operation. However, if the magnetron is damaged or nearly burned out, it may begin.
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The noise from the fan is usually louder at the back of the microwave and should be accompanied by a low hum during normal operation. If you notice a loud buzzing sound coming from your microwave, it might be time to check on its cooling fan. Clicking sounds. If your microwave is making a clicking noise, it could be due to a faulty turntable motor.
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When you use a microwave oven on a setting lower than high, the humming sound may seem more noticeable. According to GE Appliances, the humming sound occurs due to the magnetron tube turning on and off to achieve the lower power setting. The magnetron is part of the high voltage system inside a microwave. The vacuum tube produces the energy.
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Unplug the Microwave. Disconnect the power to the microwave, and the hum should stop immediately. The sound might not be coming from the microwave if you can still hear it with the oven unplugged. Keep the microwave unplugged, and contact Whirlpool if the noise returns with the power supply. References. Photo Credits.
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Options. There is a safety switch (thermostat) that is often located just behind the user interface. If there is an issue with the thermostat or connection it can cause a hum in the motor of the fan motor. Give the safety switches a test for continuity. This was the issue with a humming Samsung microwave I just repaired.