Causes of Presence Moisture in Microwave Door

Opening the door causes a short circuit in the door interlock or related wiring.

Open the door cover and clean it thnk there is screws there or clips

This moisture can accumulate from certain types of cooking (lots of boiling) in the microwave or in extreme cases, from a blocked grease filter or exhaust vent duct.

Spills or large amounts of accumulated moisture should be wiped off. Minor amounts can dry out by themselves easier if you leave the door open after cooking.

Also, when boiling on the stovetop, you should always use the hood vent exhuast fan to keep steam and grease out of the controls and the door area of the microwave. I always recommend using the vent fan with any cooking on the stovetop.

As long as it is not rusting the metal mesh screen or other parts of the door, it can be allowed to dry out over a period of days with the door open.

If it is a convection microwave, using the convection heat will help it dry.

Possible fault with your timer controller unit processor board. In many cases insects can cause secretion and so the clock circuit can malfunction. remove the unit and use a air cleaning. heat the board if there is presence of moisture.

Since microwaves act directly on moisture, this should tell you that it isn't causing any leakage from the cavity/cabinet of the unit. If microwaves were passing through the moisture, it would eventually dry out completely I don't believe there is any reason for concern.
Even bad gaskets (seals) around the edge of the door do not cause leakage. Only a mechanically bent door could cause this and it would still be very minor.
The cooking enclosure itself is what is called a 'tuned cavity' and as such, contains the bulk of the energy internally.

Check door interlock switches and moisture on the control panel causing errors.

The fan that cools the magnetron also helps exhaust water vapor. Does the fan sound as strong as it used to? Is the vent at the back of the microwave clean? Sometimes lubing fan motor bearings with light machine oil will speed up the fan. You would have t remove the cover to gain access.

faulty door switch something has reverse its function, moisture or a broken wire. get it replaced

That crackle is usually a failed high-voltage rectifier diode. It's possible that the magnetron is failing or failed, too, but I would suspect the diode first.

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 connection on the control unit circuit board
- bad magnetron or other high voltage part

It's always recommended that you have the hood fan on when cooking on the stove to prevent moisture from entering the controls of the microwave.

Also, I tell my customers to be sure no one ever sprays cleaner directly on the keypad.

But I don't think those are factors in your case.

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

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

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

Hopefully it was not an unheated storage area! Moisture and contamination can get into the controls from condensation due to big changes in air temperatures in areas like unheated storage units or garages. That being said, the most common causes of a failure to heat are in order: - bad door switches or door switch mounts - loose connection at the magnetron - problem with the control unit - bad magnetron or other high voltage part At our site, we have critical safety information, info on door switch diagnosiss and replacement, and disassembly information. You can find us via our listing here on FixYa: http://tinyurl.com/yzjozk