Hello gaspower. This is usually caused by a voltage issue. You will need to check and make sure there is 240 volts coming to the unit. If not, then that is the reason the large oven does not work properly. You can test this with a multi-meter AP3873826. Here is a link on how to use a multi-meter. http://forum.appliancepartspros...continuity-ohmmeter.html

What we are looking for is 240 volts to the right side oven. If it is not there, then the control for the right side may be bad. Also, check all wiring for the right side oven.

The outlet should be fine with the small oven working. You will check the bake element on the large oven where the wires attach to the element. This is a live voltage test so be careful. You will need to have the oven turned on and test for power at the element.

Based on the testing I would say you found the issue. You have a bad board on the unit.

You have a relay 1, and a high limit inline with L1 on the unit. Then it goes to the thermostat, from there to another relay 3, then to relay 2, and last to the board. So there are a total of 3 relays, a high limit, a thermostat, and a board on the bake circuit. Not to mention, you also have temp sensors to factor in.

Here is the break down for you: Selector Bake position closes Switches 1-L2, 2-N, and 3-E. The Thermostat closes Switches Cy1-Cy2, which cycles with the oven temperature powering Relay 1 and the Oven cycle light. When Relay 1 closes, it powers the Bake Element (208 – 240). Both the Inner and Outer Broil Elements are in series across a 120v circuit.

On convection bake, Selector Convection Bake position closes Switches 1-L2, 2-N, 3-E, and 6-1. 6-1 powers the Convection Fan through L-1 at 120v. The Thermostat closes Switches Cy1-Cy2, which cycles with the oven temperature powering Relay 1 and the Oven Cycle Light. When Relay 1 closes, it powers the Bake Element. (208 – 240). Both the Inner and Outer Broil Elements are in series across a 120v circuit.