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So unfortuantely this error code is not a good error at all. Here is the definition of this error code:
E305: Loss of communication between TCM and control module or TCM and user interface
All you can do is uninstall the oven and unscrew the top sheet metal panel. Make sure the wires between the display board and the main relay board mounted to the back of the oven are securely plugged in without any broken wires. If that all checks good and you re-apply power but you have the same problem, you need to replace the main control board on the top of the oven which is part number 12006840 and costs about $200.
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Also, try to flip the breaker off on your house to the oven for 5 minutes to see if the electronics will reset as a first step.
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