Oven makes loud popping or banging noises when heating or cooling.

Safety first: If you see sparks or arcing, turn off the oven and breaker immediately.

Step-by-step checks:

• Differentiate normal vs. abnormal: Some popping from metal expansion is normal. Repeated loud bangs or any sparking is not.
• Inspect elements: Look for cracks, burn marks, or spots where the element touches the oven wall. Replace any damaged element.
• Tighten hardware: With power off, tighten loose screws on the back panel, side panels, and rack supports.
• Test operation: Run a short bake cycle and listen. If noises persist or you see arcing, discontinue use and replace the suspect element or consult a technician.