Unlock the Right Part
for Your Repair
Find the exact part you need
Enter your model number to see parts that fit your machine.
Price Match Guarantee
In-stock parts ship the same day
365-Day Return Policy
Price Match GuaranteeChoose Product
Identify Problem
03
Find Solutions
HomeRepair HelpRCA Microwave RepairRCA Microwave is loud or noisy Repair
RCA Microwave is loud or noisy
When your RCA microwave is making a loud noise, buzzing, grinding, rumbling, squealing, or growling, identify where the sound starts before replacing parts. The most likely cause is the fan motor. Worn bearings can make the motor rumble or squeal while it runs, and a noisy fan motor should be replaced. Next, check the magnetron. A normal magnetron produces a low hum, but a damaged or failing magnetron may make high-pitched or growling sounds. A defective high-voltage diode can also make the magnetron noisy, so test the diode before replacing the magnetron. Other possible causes include a worn exhaust fan motor, a glass tray support with damaged rollers, or a failing stirrer motor that makes grinding noises. If the noise occurs only while the tray turns, inspect the glass tray support and rollers. Repairs involving the magnetron or high-voltage diode, or any repair requiring you to remove the outer cabinet, are hazardous. The high-voltage capacitor can store a lethal charge even after the microwave is unplugged and must be properly discharged before interior work. Use a qualified technician if you are not familiar with capacitor discharge procedures. Enter your RCA microwave model number to find the exact replacement part for your appliance.
01 - RCA 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.
Enter model number to search for the required part specific to your product
Top Solution
02 - RCA 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...
Top Solution
03 - RCA 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.
Top Solution
04 - RCA 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.
Top Solution
05 - RCA 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 - RCA 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.)
Highly Likely
Frequently Asked Questions
Why is my RCA microwave making a loud noise or buzzing sound?
Is a noisy RCA microwave dangerous to use?
How do I tell whether the fan motor or stirrer motor is causing the noise?
Why is my RCA microwave making noise when the glass tray turns?
How can I find the correct RCA microwave noise-repair part?
Shop by RCA Microwave Parts
Shop by Popular RCA Microwave Models
Our Story
Family-owned and operated since 1912, Burke America Parts Group is the longest-running genuine appliance, HVAC, and outdoor power equipment parts solution in North America. At Repair Clinic, we're proud to be an international brand trusted by the pros as well as the DIY community.
About Repair Clinic
© 2026 RepairClinic.com