Magnetron needs replaced.
CAUTION: Your microwave oven is capable of giving you a serious electrical shock, even when it is unplugged. We strongly suggest you seek the assistance of an appliance repair technician when conducting any microwave oven repair.
Cheaper to buy a new Microwave oven.
SOURCE: We have a KitchenAid Superba microwave and oven
Hi, it is caused by a blown 20 amp fuse in series with the Primary door switch.
CORRECTION: Most often the first attempt is to change, or adjust, the primary door switch, but components (20 amp fuse, 15 amp fuse and cavity thermostat) in series with the primary door switch are the culprit. Check and replace as necessary the 20 amp fuse, the 15 amp fuse or the cavity thermostat.
The magnetron may have either failed or
is not being supplied with the extremely high voltage required to run
it.
Make sure the !!!!capacitor is discharged!!!!!
before attempting any sort of repair.
Check the door interlock
switches first then the high voltage diode with either an AVO model 8
on high resistance range for short circuit, the feed fuse on the
primary of the high voltage transformer and then finally, the
magnetron is best checked by substitution.
Hope that helps.
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