Oven takes a very long time to reach temperature or never reaches the set temperature.

Safety: Turn off power before inspecting internal components.

• Check door seal: Inspect the oven door gasket for gaps, tears, or hardened sections. Close the door on a sheet of paper; it should grip firmly all around. Replace the seal if loose.
• Test elements: Measure resistance of bake and grill elements and compare with specifications. A significantly higher resistance than normal can reduce heating power.
• Verify sensor: Test the oven temperature sensor resistance at room temperature and compare to spec. Replace if out of range.
• Use an oven thermometer: Place an oven thermometer inside and compare actual temperature to the set value. If there is a large offset, the control board or sensor may need calibration or replacement.