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It is not the fault with the fan but the trigger to the fan is shorted. It can be the DOOR SWITCH or the Transistor switch from the board. A fault or error on the processor cannot be ruled out. Clean the main board and reset.
Hi firstly to see if it is producing energy, buy some 5mm light emitting diodes from an electronics store. cut off the leads close to the plastic body.
place in microwave and put on cook for max 10 secs, if the led's light up you have microwave energy, shut off the oven as soon as they glow otherwise you end up with a mess.
If you have energy then your problem is most probably the door interlock micro switches which after time do not operate properly. let me know the results and we can go further.
A simple test is to place a piece of bread in the microwave ( it heats up very fast) and then if your microwave was actually ON and generating RF, the bread would get hot very fast.. If it remains cool then only the fan is on. It appears that you may have a faulty door switch thou because once you open the door, your microwave should be off..
Are you sure the VENT is not on? That blower will operate regardless of the door open or closed so you must switch it OFF.
SRUte- This sounds as if you have a collapsed door switch, this would cause this problem,I would not recommend using it until repaired. But as far as recommending a good brand,each to his own everyone is different.I have done repairs for years,and I Love Panasonic products,they seem to have minimal problems.I hope this helps you out. cooltek Mar,3/08
You have one or more defective door switches, or the door switch mount is loose or damaged.
If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) 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 model number here: http://tinyurl.com/gv383