Oven emits a buzzing or humming noise from the control area when heating.

Safety first: Turn off power at the breaker before accessing the control compartment.

Step-by-step checks:

• Localize noise: With the oven running (qualified persons only), carefully listen to identify whether the noise comes from the control board area or elsewhere.
• Inspect mounting: After disconnecting power, tighten screws securing the control board and any small transformers.
• Check relays: Look for relays that show signs of overheating or discoloration.

When to replace parts: Mild humming can be normal, but loud or increasing noise may require replacing the electronic oven control board or control transformer if separate.