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If your microwave is a Panasonic microwave, that fault code means that either the magnetron or the voltage inverter is defective, shorted, or otherwise in unusable condition.
You should not attempt to fix this sort of defect yourself - the voltages inside the section that is at fault are quite dangerous. Also, depending on the defect actually occurring, that section could be even more dangerous in an abnormal way.
I would advise you to have the microwave serviced by a Panasonic microwave repairer, or replaced.
If you would prefer to go with repair-servicing it, let me know your local zip code, or town/city and state, and I will give you a list of servicing locations to call.
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