Water has penetrated inside the door

A Microwave Oven works by heating water/moisture in food: if the boiling action (e.g. when boiling water) is greater than the oven exhaust fan can cope with, then the inside will steam up and fog the door glass: this is usually OK and 'normal' (this is actual the advise in cleaning up the interior of a microwave oven - steamy soapy water - see your manual).

Hope it helps.

The first rule in using a microwave oven is NEVER NEVER NEVER put metal of any kind inside. You are very lucky to have a microwave to clean and are able to talk about it.

Clean it manually until every last bit is cleaned out ... cross your fingers and hope it works when you turn it on for the first time. Put a coffee cup full of water inside. Do not test for longer than 1 minute 50 seconds. If the water is hot, you can continue to use your oven.

Thanks for your question at FixYa.com

Hello,

What this simply mean is that there has been a problem from the fan either from the wire connection or from the Cole of the fan connected to the fan motor.

There are two ways of over coming this type of problem below are the recommendation to solve the problem

First of all set the oven on self cleaning from the below instruction or make use of your owner manual to operate the elf cleaning
Please after the self cleaning you most allow the oven to cool down to it best before opening

Some ovens are self cleaning During the cleaning process, the oven heats up to a temperature of 900 degrees Fahrenheit. The extreme heat cooks off food and spills inside the oven, leaving ash that can easily be wiped out. The oven door locks while it is cleaning to prevent the door from being opened. Self cleaning ovens are better insulated than regular ovens to keep the extreme heat inside.

1. Read the owner's manual that came with your oven before you perform self cleaning. Although all self cleaning ovens work basically the same way, there may be slight variations for some manufacturers and models.
   
2. Take out the oven racks. You need to clean the oven racks by hand, and then put them back in when the oven is done cleaning.
   
3. Wipe up any spills and messes inside the oven first, using warm water and a mild soap. Ovens smoke more during cleaning when there is food inside. Wash the inside of the oven door as well. Do not scrub the door gaskets, just gently wipe them off. Damaging the gaskets prevents the oven from sealing.
   
4. Lock your oven door manually if your model does not lock it automatically when you clean.
   
5. Open a window near the oven for ventilation. There is a certain amount of smoke when you clean the oven. The dirtier the oven is, the more smoke is created.
   
6. Turn the control on your oven to "clean" and set the timer for 2 to 5 hours depending on how dirty your oven is, and what the manufacturer recommends.
   
7. Wait for the cleaning to finish and the oven to cool before opening door. When oven is fully cooled wipe up any ash inside. If your oven is not completely clean, next time set the timer for longer. If your oven is spotless you might want to see if you can get away with a shorter cleaning time.
   

SOLUTION 2 IF THE ABOVE RECOMMENDATION DID NOT SOLVE THE PROBLEM

Then you will have to replace the hole of the fan from the oven i.e the fan is need to be service

Hope this help?

Thank you and thank for using fixya.

Look and see if there are screws holding the inside of the door to the outside of the door.
If so, remove the screws and the door should come apart, and may be cleaned.
God bless your efforts.

I have a Kenmore with similar issues.
Model 665.61639100
Anyway, good luck with this. Hope someone has an answer for you (and me).
Mine has a open slot on the top front of the door. Kinda like a double plate window execpt for the opening in front. Why is this there? I don't know. Weird design. But it leaves for the possibilty of liquid to splash in there leaving it hard to clean (like impossible).

I'm thinking I have to completely remove and disect the door.

First, wipe out any excess crumbs. Then fill a microwave-safe bowl with about 1-2 cups of water. Add some lemon juice, or put in half a piece of fresh cut lemon (squeezing some juice out first) into the bowl... Microwave until the water is boiling. Then let it sit for a few minutes to let the steam penetrate the interior. Carefully remove the bowl and interior tray. Wipe down the interior with a damp cloth. Wash the tray in the sink with dish soap, dry, and then return to microwave. For the outside, spray with a kitchen cleaner and wipe with paper towels. The main idea is that the steam from the water will loosen food particles, and the lemon will add a fresh smell.

THE DOOR ON MY MAYTAG MICROWAVE OVEN HAS A SCREEN OVER IT. I HAVE SOME FOOD SPATTERS THAT PENETRATED THE SCREEN AND I CAN'T CLEAN THE GLASS THAT THE SCREEN PROTECTS. HOW CAN I REMOVE THIS SCREEN TO CLEAN THE GLASS?

i have the same problem, there is a brown spot about 3 inch
by 2 inch at the bottom of the glass, I cannot clean it, it looks
like its in between the glass.

The brown spots are usually grease / smoke deposits. Usually there are indeed two sheets of glass in the door. If the grease is not arcing or smoking, and the metal screen / mesh (that blocks microwave leakage) is not damaged, then it's likely better left alone. It might be useful to boil a few cups of water with a little vinegar inside the microwave to help dissolve the deposits. In case you want to take it apart, I have attached a photo from a similar model that illustrates disassembly of the door. It is not necessary or advisable to remove the door or hinges when disassembling the door.