Oven takes excessively long to preheat; may never reach high temperatures.

Safety first: Disconnect power before testing elements or terminal block.

• 1. Check supply voltage: Have a qualified person verify that full 240V is present at the oven's supply. A missing leg will cause slow heating.
• 2. Inspect elements: Observe the bake and broil elements during preheat. Both should cycle on. If one never glows, test and replace that element.
• 3. Door seal check: Run your hand (without touching hot surfaces) around the door perimeter during operation to feel for hot air leaks. Replace the gasket if leaks are significant.
• 4. Control relays: If elements and voltage are good, but preheat is still slow, the control board relays may not be energizing both elements properly. Board replacement may be required.