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It is likely that the heater element is faulty. These elements can fail with a ground fault. You should get a quote for repair as it may be more economical to buy a new one, and you get a warranty too.
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Microwaves have fault codes to help us determine the problem. Click the link below, it will take you to the Panasonic Combi Microwave site. Look at the manual closely. Either the fuses are blown or the microprocessor board is fried. Good Luck and be careful! Safety first! Commercial Microwave Ovens Large Microwave Commercial Kitchen Appliances...
Confirm that the receptacle where the microwave is plugged in is not faulty by plugging something else in the recepticle and seeing if it works or if the fuse blows. Check the power cord of the microwave for broken, frayed wires. Also check the bulb socket for broken wires. It may or may not be worth the cost of repair, depending on the repair cost verses a new microwave. There are repair parts available.
What else in on the circuit? Your oven should be on its own. If you live where I live, this should be a 20 amp 120 Volt AC branch wired directly from your power panel.
If this is not the case, have a licensed electrician install a proper circuit for you.
Obvious thing is to try plugging in a different receptacle to verify if it might be bad wiring in your kitchen. Make sure to use a different circuit, maybe in different room. If it is the circuit, then likely cause is those plugs with push in back wiring. Replace with ones that wire screws to.
Sounds like you have a intermittant shorting high voltage capacitor. I have had several of these that check good at rest then short after power is applied then un short by the time you put your meter on it to see if it is shorted. Best suggestion it to substitute the capacitor. The only othe rpossibility is you HV transformer is shorting out. You can completly disconnect the leads to the xfrm and run 120v to the primary. if it draws over 15 amps it is shorted. if it is shorted it could draw up to 30 amps. I would try subbing thecapacitor and if that does not cure it, it is most likely the Xfmr.
Make sure it is plugged into a 20 amp circuit. If it is in a kitchen it should be a 20amp breaker if it trips a 20 amp breaker it needs to be replaced. If it is a new house and you plug it in in the kitchen and it trips a 15 amp breaker then the house does not meet code. ref Article 210.52(B)(1) NEC
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