A circuit that handled the old single oven can be too small for this one. The HBL5651UC is a 500 Series double wall oven. Two cavities of 4.6 cubic feet each sit one above the other in an opening 52 1/16 inches tall, and together they draw 8,600 watts.
That total is what sets the electrical requirements, since both ovens can be on at the same moment. Everything seems fine until a holiday dinner, when someone preheats both cavities and the breaker trips. Both ovens offer pizza, proof, convection roast and convection bake, controlled by touch with a Sabbath mode.
As the unit ages, the upper cavity can run a little warmer than the lower because heat rises past it, and a single element can give out in one cavity while the other works as usual. On a visit we ask when the breaker trips, then check each cavity separately.
More likely the circuit is too small. A double oven's combined draw is published and far above a single oven's, so an electrician should check the rating of the breaker and wiring.
A small gap is normal, because heat rises through the stack. A large or newly appearing difference points to a sensor or seal problem in one cavity.
Usually, if the trouble stays inside one cavity, since each cavity has its own elements and sensors. Only a shared control problem would stop both ovens together.
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