Hi Maria,
I'm not familiar with your specific model so this is just general advice.
So when you use the microwave cook function, the turntable turns and the timer counts down, but there is no heating, is that right?
This part of the microwave is pretty simple - it consists of a transformer and the magnetron (the thing that generates the microwaves) and a few other components, BUT there are very high voltages involved, and you need a high-voltage probe and you need to know exactly what you're doing if you want to fault-find that part of the unit, because if you don't, you CAN quite easily kill yourself, and I'm totally serious here. Even qualified technicians have killed themselves doing this wrong (so I'm told). So it would be very unwise to go poking around in there with the power on.
You could UNPLUG THE UNIT and open it and check the fuses. Flick them out with something made from wood or plastic and measure them with a continuity tester or a multimeter. If a fuse is blown, this will often be due to a failed magnetron or other component, and replacing it may just blow the new one immediately. Also these fuses are often special HRC (high rupturing capacity) types and you need to use an exact replacement. Fuse blowing can be due to the door microswitches shifting out of alignment or failing internally, and the act of opening or closing the door can blow the fuse, so if you find a blown fuse, and replace it, close the oven door (and put the cover on!) before plugging it in and trying it.
As you can probably see, it's best to take it to a repair shop for a problem like this, and let them take the risks!
Kris Heidenstrom - kris at heidenstrom dot gen dot nz, August 2009
