GE wall oven shuts itself off

Brand:GE
Model Number:PT916SR1SS
Main Symptom:shuts off
What happens & when:after 1+ hrs on conv roasr

Error Code (if any):
Parts or tests already tried: new control board
Photos / video link:

Start by using the tech sheet packaged with the oven (usually in or around the control area) and a multimeter to check for fault/error codes. For instructions for using a multimeter see this link : https://www.youtube.com/watch?v=8p0uj2tnDlg&t=3s

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