Question about Whirlpool 1.6 Cu. Ft. Over-the-Range Microwave

1 Answer

Intermittant knocking noise

The microwave is still cooking properly but there is a knocking noise about once with each microwaving. At first I thought it was a lid blowing off because it sounded similar.

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  • Whirlpool Master
  • 17,129 Answers

If there is spark please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is leaking and sparking to the ground. As you have mentioned it was stored, it is quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Now switch the microwave power on and use a cup of water to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. Replace with same type. If not check the waveguides within the cabin for food particles that can burn and spark, check for rust that can corrode and spark when the ceramic paint has worn out.
If there is heating without any issues, you can use the microwave safely

Click on replacing waveguides: http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html

Also check the belt below the turntable as it can produce this jerking movement due to friction of the drive, poor motor or belt.

Posted on Jan 22, 2013

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Posted on Jan 02, 2017

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jsrock516
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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.

Posted on Jul 31, 2007

  • 209 Answers

SOURCE: Microwave malfunction

this could be a diode between the capacitor and magnetron, (its like a fuse) i do not recommend self repair, but give you this info as a guide to what maybe wrong, microwaves contain high voltage and care should be used if you do attempt repair hope i have helped a little

Posted on Oct 04, 2007

MicrowaveSvc
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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

Posted on Nov 17, 2007

  • 1 Answer

SOURCE: microwave troubleshooting

I found the fix to the F3H error on another site. Just turn the power to the microwave off for ~2 minutes at the circuit breaker, and then turn it back on. Microwave will start working again then.

Posted on Apr 22, 2008

  • 76 Answers

SOURCE: everything works except the cooking part/no heating/turntable not turning, help!

you may have gotten a power surge and that can cause some funny things to happen, 1st is there power to the oven, 2nd if so there may be an internal fuse protector built in to the oven, check with the manual for anything of that sort listed. if not you may have to take it in and have it repaired by a pro. there is a lot of voltage in these ovens and unless you know what you are doing a person could get hurt

Posted on Jan 03, 2009

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prototech@usa.net
http://www.microwavedisplay.com

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