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HomeRepair HelpTappan Microwave RepairTappan Microwave is loud or noisy Repair
Tappan Microwave is loud or noisy
When your Tappan microwave is making a loud noise, rumbling, squealing, grinding, or buzzing, start with the fan motor. Worn fan motor bearings commonly cause a microwave fan noise, especially while the motor is running, and the motor should be replaced if it is noisy. Next, check the magnetron. A normal magnetron produces a low hum, but a damaged or failing magnetron may make high-pitched sounds, growling, or loud buzzing. A defective high-voltage diode can also make the magnetron noisy, so test the diode before replacing the magnetron. If the diode is burned out or fails testing, replace it. The exhaust fan motor is another possible cause. Check whether the fan blades turn freely, then test the motor for incoming voltage and continuity. A worn glass tray support can cause noise as the turntable rotates, while a failing stirrer motor may produce grinding sounds. Opening the microwave cabinet exposes a high-voltage capacitor that can store a lethal charge even after unplugging. Proper capacitor discharge is required before interior work, and magnetron or high-voltage diode repairs may require a qualified technician. Enter your model number to find the exact Tappan replacement part.
01 - Tappan 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 - Tappan 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 - Tappan 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 - Tappan 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 - Tappan 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.
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06 - Tappan 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 Tappan microwave making a loud buzzing or grinding noise?
Is a noisy Tappan microwave dangerous to use?
How do I test the Tappan microwave exhaust fan motor or cooling fan motor?
Why is my Tappan microwave noisy when the turntable is spinning?
How do I find the correct replacement part for my noisy Tappan microwave?
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