Oven takes excessively long to preheat or never reaches the set temperature.

Safety first: Turn off power at the breaker before accessing electrical connections.

Step-by-step checks:

• Observe element glow: During preheat, look through the door to see if the bake element glows evenly red. Dark spots or uneven glow indicate failure.
• Check supply voltage: Have a qualified person verify that both hot legs of the 240V supply are present at the terminal block.
• Continuity test: Test the bake element for proper resistance. A significantly higher resistance than spec can reduce heating.
• Inspect wiring: Check for loose or burnt connectors at the element and control board.

When to replace parts: Replace the bake heating element if weak or partially open. Repair or replace damaged wiring. If voltage and element are good but heating is still slow, replace the control board.