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MICROWAVE OVEN CONTROL PANEL DOES NOT POWER UP. WHEN DOOR IS OPEN THE OVEN LIGHT IS ON.

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  • Microwave Ovens Master
  • 8,820 Answers

This is probably a bad connection or bad low voltage transformer on the control board.

We regularly repair these control units forcustomers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee. If it needs a transformer, that adds $25.

Feel free to contact me directly (and please remind me of your model number) for more information & help.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Posted on Nov 08, 2008

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We have magic chef Over the Range Microwave Oven Model: MCO153U. Microwave was dead and no power


The original problem, was probably caused by a bad door switch along with the fuse, now there is a good chance the control panel is damaged, you will need a professional to assess if the item is worth fixing.

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If "control panel not working" means no display, clock not on, etc. but the interior light comes on when the door is opened(power is being received and transmitted from transformer\rectifier) I would check to see if power is being received by control panel(with a multimeter, checking for voltage at the input terminals). If it is receiving power but not working, the "repair clinic" on the internet is a great place to look for replacement parts.

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This is typical of the 20 amp fuse blown. It can blow due to slamming the door or even opening the door to quickly while it is running. It could also blow if there is a failure of one of the door interlock switches. This fuse is ceramic and looks similar to a cylinder automotive fuse and is located behind the control panel on this model.

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Some units also have a thermal fuse in line. Usually above the oven cavity. Look at your wiring schematic and see if it shows one, test for continuity and replace if bad. Also check to see if your main power comes in through your door interlock switches. Test each one for continuity with the door open and closed and replace if bad. If this is not it, you probably have a bad control board and it is usually not worth repairing. With Microwave Ovens we want to make sure your are careful. Even with the power off you can get shocked by the capacitor. Never work on a microwave oven with the power on. Very Dangerous Good Luck, Appliance Specialists.

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Is anything working? Light when you open door? Is your area prone to have Voltage Surges? Did anything else in your home fail at the same time? These may sound like DUMB questions, but they are necessary.
If the light comes on when door is opened then the FUSE is ok. If the light comes on, but nothing else, you have lose a Control Panel. Perhaps from power surges.

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The most likely causes are a bad door switch or a problem with the control panel assembly. You can find critical safety information plus our information file on checking and replacing door switches at our site, via our poisting here: http://tinyurl.com/yzjozk If you need control panel repair, we do that for $32.50 nationwide.

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Microwave Comes on when Door is Opened


It sounds like a problem with the door switch or mount or the control panel. I've attached an exploded view of the oven which shows the door switches and mount. They're located behind where the door hooks go into the chassis. You can find our safety and disassembly instructions at our site via my link here: http://tinyurl.com/yzjozk If it's not switch-related, then you may have a shorted component on the control board. We repair these for customers nationwide for $32.50 postpaid in most cases.

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