Lg oven not properly heating

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Brand:
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Main Symptom:
What happens & when:

Error Code (if any):
Parts or tests already tried:
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Tested temp sensor, and both elements and all test good. When oven temperature is set at 350 the actual temperature is between 25 and 50 degrees lower than set temperature.

If oven sensor tests good and the elements test good, the oven control will be the problem