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Probably the fan
Sorry, there was a problem. Please try again later.Thank you for contacting the Oster® brand. We appreciate the opportunity to respond to your inquiry about the Oster XL French Door Digital Air Fry Countertop Oven - Stainless Steel. We want to inform you that the popping noise during use of your oven and air fry is normal. As the oven heats up the metal begins to expand and makes a popping noise. This also occurs when the metal starts to cool down and contract. If you have more questions, please contact us directly for more assistance. Have a great day!
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