Check the oven sensor for continuity. The normal reading should be about 1100 Ohms at the room temperature. If the reading is correct, replace the control board.
- The oven sensor Part number: AP4326911
- The control board Part number: AP3837679
Here are the breakdown diagrams and Replacement parts for WHIRLPOOL GR448LXPB0 30" ELECTRIC CERAN FREESTANDING RANGE SELF CLEAN OVEN | AppliancePartsPros.com