Microwave spark service — sparks inside microwave are dangerous. Common causes: metal/aluminum container by mistake, burnt mica sheet (waveguide cover), or faulty magnetron sparking.
See if any of these signs match your device — each one increases the likelihood of this fault.
These are the causes we encounter while repairing Sparks inside microwave — ranked from most to least common.
Metal container, aluminum, or with gold/silver parts (most common)
Burnt mica sheet (waveguide cover) from grease
Faulty magnetron sparking
Burnt food remnants on cavity walls
Hole or crack in cavity
Bad high voltage diode
Any of the following = a danger signal — call now and don't try to fix it yourself.
On-site diagnosis, clear pricing before any work, and a documented 6-month warranty.