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Microwave makes strange sound when turned on

At first ... about 2seconds it sounds normal but then the fan starts making a louder sound

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The fan motor either needs maintenance including lub or it need to be replaced.

Posted on Jan 02, 2009

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The GE Spacemaker Microwave Oven model JVM1540 makes a loud fan noise whenyou turn it on. Sounds like the exhast fan but it not?


It sounds like from the description when it is running the noise comes from the magnetron, some microwaves are louder than others, but this could be an early sign the magnetron is going.

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Microwave turns on but it makes strange noises and does not cook anything. After a little while I get an error message that says something like cooking sensor has timed out


So we can help you, please post a NEW question, and please include your full model number from the tag in or on the unit, as well as the answers to these questions:

When you try to microwave are the inside light, internal cooling fan and turntable all working?

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A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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If it making a louder than normal humming or grunting sound when operating, than it's a sure bet it's the MAG.

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