I put something in the microwave and it cooked it so much faster than normal and made a big mess inside (30 sec cook time). After cleaning it up i closed the door and heard a low humming noise that wasn't normal. I opened the door and it stopped. Wondered if the microwave was hot and there was some fan trying to cool it off. Left the door open overnight (thankfully) because I didn't trust the odd noise. The next morning used it to heat something and again it was way to fast in cooking. The humming noise was present when not turned on and door closed. Out of curiousity i put a bowl of cold water in and closed the door without turning on the microwave. After about 30 seconds or so i opened the door and the water was boiling. Scared the **** out of me that my microwave would not turn off without either opening the door or unplugging it. If i would have closed the door the night before when i went to bed it would have burnt my house down. Is this a known issue?
Known defect as they get older, cut the power cord and trash
We are very sorry to hear this and we apologize for the inconvenience this has caused you. We would be glad to look into this if you could email us at [email protected] with your name, address, phone number and the model & serial numbers of the Microwave.
SOURCE: Maytag Rangehood Microwave Loud Humming
Sounds like you just fried your magnetron. Normally when they go bad, they make a very loud noise like what you described. The smell concerns me because you may have ruined the waveguide as well. If the magnetron burns through the protective painted surface of the waveguide, the waveguide is ruined. In most microwave ovens this means replacing the entire unit because the waveguide is not replaceable. Putting a new magnetron in a damaged waveguide will result in the same arcing and eventual failure. In addition to the magnetron, the following components are part of the same high voltage network: HV Transformer HV Diode HV Capacitor Magnetron Thermal Cut-Out Any one of these components could have also been damaged. I DO NOT recommend taking any voltage measurements inside the HV network. Potentials of over 4000 volts can be reached and make it very dangerous for the do-it-yourselfer. Taking resistance readings with the unit unplugged is strongly encouraged. If you decide to pursue a repair, inspect the magnetron tip and inside of the waveguide first. If the magnetron is melted and/or there are burn marks inside the waveguide, a new microwave may be a in order. This actually may be a better option than an expensive repair. I hope you find this advice helpful.
SOURCE: GH7145XFB-1 not heating properly
Generally, the most common causes of a failure to heat are:
- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose conneciton on the control unit circuit board
- bad magnetron or other high voltage part
If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk
SOURCE: microwave doesn't heat, plate doesn't turn
Hi,
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Microwave Oven Basic Troubleshooting Tips
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