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Home /  Appliance Maintenance / Secret revealed! Know why microwave oven makes noise
last_updated_date Last updated: December 2, 2020

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Secret revealed! Know why microwave oven makes noise

PUBLISHED: February 5, 2020 4 MINS READ

There is no doubt that microwaves are a boon to humankind. From heating leftover food to defrosting meat, microwave ovens cater to our several needs. Unfortunately, this useful appliance can sometimes create several problems, one such being the loud noises. In this article, we will walk you through why microwave oven makes noise and few tips to overcome it.

Why Microwave Oven Makes Noise

Benefits of microwave oven

Invented in 1946, microwave ovens eliminate the need for spending considerable amounts of time in heating or cooking the food. Besides reducing the cooking time, microwave oven offers several benefits.

Some of the added advantages of using microwave oven include:

  • Preserves nutrients
  • Safer when compared to cooking with fire
  • Increases convenience 
  • Conserves energy

Owing to its range of benefits, there is a significant increase in the use of microwave ovens in America, and thereby, increase in brand manufacturing microwave ovens.

Despite purchasing a microwave oven from a reputed brand, and handling the appliance with immense care, many a time, you might witness that your microwave oven is making loud and unfamiliar sounds. Although it is natural for a microwave oven to produce a humming sound while heating up the food, loud noises are unacceptable.

Why microwave oven makes noise?

Undoubtedly the microwave oven is one of the most used kitchen appliances. Since it is used too often, over the period it is likely to give rise to undesired loud noises.

Here, we have listed some of the common reasons why microwave ovens make noise. 

Problem with turntable 

This is one of the most common reasons for loud noises emitting from the microwave oven. Constant use, mishandling, and aging may not only make the turntable problematic but also malfunctioned. 

The problem can be resolved by simply removing the turntable and putting it back firmly. However, if the problem persists, replace the turntable or call an experienced technician.

Problem with magnetron tube

The magnetron tube basically does the job of generating the frequency which is required to heat the food. When in good condition, the tube functions smoothly. However, if you hear high pitched or growling sound emitting from the microwave oven while heating or cooking, then high chances are that the magnetron tube may have malfunctioned.

The key solution to this problem is to replace the magnetron tube. However, before replacing the tube, test the high voltage diode. Many times, a defective high voltage diode causes magnetron to be loud. If the voltage diode is in good condition, then the only solution to overcome this issue is to replace the magnetron tube.

Issues with stirrer motor 

Another major reason why microwave oven makes noise is the stirrer motor. Stirrer motor is the key element that causes the food to cook evenly. Typically, the stirrer is a metal blade that rotates slowly and distributes microwave energy throughout the oven. Due to its constant use, the stirrer motor becomes worn out resulting in the grinding noises.

To determine that the stirrer motor is worn out, test if the voltage reaches the motor. If the motor gets the voltage but is still noisy, call the professional technician and replace it. 

Exhaust fan motor issues

Yes, you read that right! An exhaust fan motor can be the reason behind the loud noise. To determine if the fan is defective, remove the fan motor from the microwave oven and run the blades manually. 

If the blades don’t turn, replace the fan motor. If the blades are turning freely, use multimeter and test for the incoming power and continuity in the motor. If the motor lacks continuity, then replace the motor.

The above-mentioned reasons (not limited to) are the most common ones that cause loud unpleasant microwave oven noise. One possible way to forestall noises is through regular microwave oven cleaning

Also, to avoid burning a hole in your pocket, obtain full coverage for all your microwave oven components via home warranty. 

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