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HomeRepair HelpGibson Microwave RepairGibson Microwave is loud or noisy Repair
Gibson Microwave is loud or noisy
Is your Gibson microwave making a loud noise, grinding noise, buzzing, or humming loudly? The most likely cause is a worn fan motor, especially when the sound is a rumble or squeal while the fan runs. If the noise comes from the cooking circuit, the magnetron may be damaged or nearing failure. A defective high-voltage diode can also make the magnetron growl or whine, so test the diode before replacing the magnetron. A failing exhaust fan motor can cause fan noise as well. Check whether the fan blades turn freely, then test the motor for incoming voltage and continuity. If the sound occurs as the tray rotates, inspect the glass tray support or turntable roller guide for worn rollers. A failing stirrer motor commonly makes a grinding noise. Any repair requiring removal of the outer cabinet, including work on the magnetron, high-voltage capacitor, high-voltage diode, or high-voltage transformer, is hazardous because the capacitor can store a lethal charge even after the microwave is unplugged. It must be properly discharged. Use a qualified technician if you are unfamiliar with capacitor discharge procedures. Enter your Gibson microwave model number to find the exact replacement part for your appliance.
01 - Gibson Microwave Fan Motor
The fan motor bearings can wear out causing a rumbling or squealing noise. If the fan motor is making noise when its running it will need to be replaced.
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02 - Gibson Microwave Magnetron
The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances, the magnetron emits a low hum. However, if the magnetron is damaged or nearly burned out, it may begin emitting high-pitched sounds or growling noises. If the magnetron is noisy, this indicates that the magnetron is nearing the end of its life or might be defective. A defective high-voltage diode can also cause the magnetron to be loud. Before replacing the magnetron, first test the high voltage diode. If the diode is not defective, replace the magnetron. (Warning: The microwave oven c...
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03 - Gibson Microwave Diode
The diode converts the AC power output of the transformer to DC, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron to heat the food. A failing diode can be responsible for a noisy magnetron. When the diode fails, it is often visibly burned out. Inspect the diode and if the diode is burned out, replace it. If inspecting the diode proves inconclusive, test it with a multimeter that uses a 9-volt battery or put a 9-volt battery in series with the diode. When the leads are reversed, the diode should only have continuity in one direction.
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04 - Gibson Microwave Exhaust Fan Motor
To determine if the fan motor is defective, remove the fan motor from the microwave and try turning the fan blades by hand. If the blades do not turn freely, replace the fan motor. If the fan blades do turn freely, use a multimeter to test the motor for incoming power and for continuity. If the motor has power but won’t run, replace it. If the motor does not have continuity, replace it.
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05 - Gibson Microwave Glass Tray Support
The microwave glass tray support is the component that sits under the glass turntable tray to support the tray as it rotates. Over time, the small rollers on the support can wear out and start making a noise as the tray turns. If you've determined the glass tray support is the source of the noise, the part should be replaced with a new one.
Highly Likely
06 - Gibson Microwave Stirrer Motor
The stirrer is a metal blade which slowly rotates inside in the microwave. As the stirrer turns, it deflects the microwave energy randomly throughout the microwave. As the stirrer motor wears down, it begins to make grinding noises. To determine if the stirrer motor is worn out, check to see if voltage is getting to the motor. If the motor has the proper voltage, but is noisy or won’t turn, replace it. (Note: Proper voltage can be determined by reading the label on the motor. Because the stirrer motor is a geared motor, the shaft will not spin freely.)
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Frequently Asked Questions
Why is my Gibson microwave making a loud or grinding noise?
How do I test a noisy Gibson microwave fan motor?
Can a bad diode make a Gibson microwave magnetron noisy?
What should I check if the noise comes from the microwave turntable or stirrer?
How do I find the correct Gibson microwave noise-related replacement part?
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