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So the only thing that would cut out heat to both the cooktop and the oven is if your oven is only getting 110 volts and not 220 volts from your house. You're going to need a multimeter to test power most likely. Flip the circuit breaker off for 60 seconds and flip it back on to see if that resets power. If not, then pull the oven forward and remove the access panel on the back of the oven where the power cord connects to the back of the oven. Use a multimeter to test power between the 2 outside power terminals on the terminal block. You should have 220 volts. If not, then you know you have a power issue with your house, the power cord, or the plug receptacle. If you do have 220 volts from your house to the terminal block on the back of the oven, there is a shorted wire somewhere between the control panel and the terminal block you'll need to track down.
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There is no thermal sensor that affects both the cooktop and the oven. It sounds like you were just getting a bad connection from the power cord so unplugging it and plugging it in again allowed it to get a better connection
I assure you this is the answer. Sometimes contacts on the cord just develop a bad connection and just wiggling them will give a good connection again. Again there is NO thermal sensor or cut out on this oven that will affect both the oven and cooktop. Only he supply power can affect that as I originally advised