Appliance Repair Questions? Ask a Technician for Answers ASAP
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I'm sorry to hear of the problem with your oven.
What kind of conditions was the oven kept in? Was the garage dry or damp? Was the oven covered, or wrapped up? Have you taken the back panel to make sure no creatures have nested inside?Which device is tripping - MCB, RCD, or RCBO?
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It's possible for an element to corrode during that period of storage, or for the internal insulation to break down. You can test the resistance of all elements, but that won't always show up a fault. You need to use an IR (insulation resistance) tester to check it thoroughly.
It can only be an element, or rodent damaged wiring.