Australian Whitegoods Questions? Ask a Technician for Answers ASAP
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Most likely to cause that issue is a short in the high voltage section. When it runs, do you ever see sparking form inside the unit near the top? Any discoloration or arc marks on the inside oven cavity?
If it is sparking inside, replace the microwave. The antenna cavity is damaged and it cannot be repaired. Save the call out fee.
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Well, I suspect the issue is in the high voltage side of the components so you really can't test safely and because it is intermittent, reliably. If you wanted to try a part, I would replace the magnetron.