Over-the-range microwave's timer, clock, fan (while running), exhaust fan, and lights all seem to work but suddenly doesn't heat. Found 1 of the fuses behind panel which seems to be okay. Can't find the magnetron fuse to check. Any ideas?

Suzie, March 2009

Hi, don't know the machine but, as with all microwaves it will have either a didode array or a high voltage fuse. However you need a multimeter to check diodes and it needs a minimum of a 9v battery test to work. If heating has suddenly stopped it is most often to do with door switches, the safety interlocks and the monitor fuse. Remember microwave ovens can and do kill people every year even when unplugged. call me for advice
kindest regards
B.E.S. Microwaves
01424 447799

patrick, March 2009

The most common things that would cause this situation are: Relay on computer board, Open High Voltage rectifier, Door interlock switch, or magnetron tube.

D.Howell, March 2009

some microwaves (early sharp) dont have them.
They are connected to the big transformer at bottom of oven, usually in a plastic case.
About 1 1/4 inch long fuse inside.
If it's gone, it might have a faulty diode, see my answer for faulty 'delonghi'

John, March 2009