Microwave started acting strange and fan was running when you opened the unit, then operation was intermittent,

The symptoms would seem to indicate a short caused by moisture on the circuit that supplies power to the fan.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

-You're already answer yourself.


Good luck


Mai

Unit uses a Magnetron and likely a power board called an inverter to run it. Someone would have to open the unit in a way where they might pinpoint where the sound is coming from and then take action--does not of course sound normal or good to me.

You should first be sure your filters are clean and that your ductwork is clear.

See this link for a bulletin that may address your problem.

Otherwise, see this link in case you have a sticky door switch or relay.

You can find helpful GE exploded views and order GE parts here, and download GE owner's manuals and installation instructions here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Hi

If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work. You should check the internal door switches, the high voltage circuitry and the circuit board for this kind of problems. But for that you will need a certified technician to help you make these repairs.

Mate - send the unit back to Miele- thats poor service on their part, the stirrer fan must be running to be effective.

No its not a common fault - I would think the unit was not serviced properly.

The turntable fan and light all share the same feed, first check wiring for loose connections the problem though is most likely with the controller

Unplug your microwave. Open the back remove and oil the fan motorand clean the fan or replace the motor. 

It is a door switch problem of some sort.  I have two Sharp R-1611 units that do the same thing.  The light and fan come on, but not the heat, thank goodness.

I am going to replace it since the plastic for the case and door is cracked in numerous places.  I have spent several hours researching microwaves online have not a single clue what to replace the Sharp with.  Seems like every vendor has very good units and very bad units.  I guess you just pay your money and take your chances.

Sounds like a loose connection or a failing hood thermostat. That's right behind the control panel on the base plate. If you or a friend decide to work on it, we have *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your base model number (without the suffix) here: http://www3.sears.com/