You'll need to open the microwave's cabinet and discharge the high-voltage capacitor. Its best not to ignore these warning signs. If the third one fails and remains closed, it creates an unintended circuit loop that causes hum, although not necessarily operation at full power. Each reading should be less than one ohm. Gas Oven Makes Puffing Sound? 9 Reasons Why This motor moves a blade that distributes electromagnetic waves throughout the inside of the microwave to ensure even cooking. Lastly, avoid using metals or non-microwave safe utensils in the microwave, as that leads to cracking sounds too. I tested the power relay on the main board and found it stuck on closed shorting the power to the transformer. It's normal for a microwave fan to make a low noise during operation, but a clogged fan often makes a buzzing sound. The control relay is cycling between the bake and broil elements. So, when the device is running on a low setting, the magnetron is likely switching on and off for low-frequency generation. Tom Riordan. Saturday: 9:00am 3:00pm. Depending on the model, a healthy diode will read between 50,000 and 200,000 ohms. The cooling fan, as you can guess, cools. However, before measuring the electrical resistance, youll need to discharge the microwaves capacitor so that you dont damage the other parts in the microwave or get electrocuted. Apparently jotting things down is what separates us humans from the rest of the animals, allegedly. Hence, the cooling fan parts tend to clip against the one responsible for that rattling sound. I'm sure this has freaked many people out; the mysterious and intimidating popping sound of the microwave. The fan. If this isn't possible, turn the circuit breaker off. So the inside boils before the outside, so the pop it is merely steam escaping. Apr 14, 2019 by Microwave Making a Noise When Off: Causes and Fixes If the ohmmeter reading is less than 1 Ohm, the magnetron is functioning correctly. Oh, my!! Hi-this is Sue from GE. Now it is all fixed. I have had three microwave and all three have done the same thing and blue fire shoots out the back, Nov 2, 2020 by Frigidaire Microwave Is Making Noise/Sound [Solutions] Check to see if the noise stops after a while. Remove the motor's cover. A high pitch or loud hum points to the magnetron or diode, while a rattling or buzzing sound from the rear of the microwave indicates the cooling fan is at fault. @gyarados, did the popping occur on the first use of the day or each time the unit was used? Regional office:150 King Street West Suite 200, Toronto, ON M5H 1J9. Follow these steps to diagnose and fix a faulty cooling fan: Another source of microwave noise is the turntable motor. And, this leaves us confused and asking, why is my microwave making popping noises?.
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