Open the lower oven door and remove the screw on each side trim. Pull the trim out from the bottom and slide it down to release from the control panel tab.
Remove the screw on each side of the control panel. Pull the control panel out from the bottom and push it up to release from the tabs.
Unplug the control panel ribbon from the slot on the control board and clean it, using an eraser. Plug the ribbon back into the slot.
Check the low voltage transformer for continuity across the two red and the two blue wires. If any of pairs is open then the transformer has to be replaced.
- The part number for the low voltage transformer is AP3968801
Reconnect all back, turn the power "on" and post the results.
Here are the break down diagrams for the Whirlpool oven Model RBD275PDB12