20 Most Recent Maytag MMV1164WS Microwave Oven - Page 6 Questions & Answers

That "Cardboard" item is a wave guide cover and is critical part of the machine.
It is made of mica and needs replacing. The magnetron is OK as long as it does not spark too much or get any foreign items in there.
Replace the wave guide cover.

Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also 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. Check this link to know how a microwave works:

http://www.espares.co.uk/advice/microwave/a/5/1443/how-a-microwave-oven-works.html

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. Check the wave guide covers, if food had deposited then it must be checked or replaced. See link: http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html

Now keeping clear of the microwave, switch on; use a cup of water inside 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 there is heating without any issues, you can use the microwave safely

"SE" means you have a defective membrane keypad.With your full model number, I could have given you detailed instructions and parts numbers.But without that, I'll have to just be generic.If your model's membrane keypad is available as a separate part, that's usually the cheapest but most involved way to fix it. Here is a handy guide with pictures showing you what's typically involved. If it's not available separately, then you can replace either the control panel frame assembly, which comes with a new keypad on it, or the entire control box / controller assembly. There is a a YouTube video available showing how to remove a typical over the range control panel assembly in under 5 minutes. Some connectors have a lock. You can usually find helpful exploded view diagrams and order parts by entering your full model number here.We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

It stands for system error, the keypad will not function at all, because there is a short in the keypad membrane.

It may be a line fuse or a failed thermal cutout / TCO on the magnetron of on the top of the oven cavity, or possibly a defective controller.You can see a YouTube video here which shows you how to safely remove the controller assembly in about 5 minutes.Then you can find the technical sheet hidden behind the controller or elsewhere inside the oven. It's helpful in locating and testing components for possible replacement.You can find exploded views and order parts by entering your full model number from the tag here.If you still need further help, please let us know.

Measure the opening and also the trim kit dimensions and go shopping for a new unit as 10 old ones rarely have parts available