My microwave Oven works just fine, except that once in a while it causes the fuse to jump.
The "funny’ part, is that it only happens on “de-frost” or “medium”, never on the “high” setting. Does that make sense?
Jump? Is that like blow, or trip?
The defrost and medium settings “pulse” the power, not lower it. It turns on and off at full power. So the fuse sees more surges from the magnetron starting.
Peace,
mangeorge