Anyone know why does my countertop air fryer make a loud rattling noise and how can I fix it?

Hi Chloe, start by isolating the source :) Run at 400°F with the basket seated but without the crisper tray or racks; if the rattle stops the tray is vibrating and slightly bend or temporarily shim its tabs with folded foil to confirm. If it persists press gently on the top and side panels with an oven mitt while it runs; a change points to panel resonance or loose feet, tighten exterior screws, make sure all feet are present, level the unit, and test on a heavy cutting board to decouple the counter. If it still rattles preheat until the noise starts, then cancel and unplug and listen to the fan spin down; scraping or ticking on spin down points to a loose or warped fan or shroud. When fully cool remove the basket, look up at the fan and element area for rub marks or debris, check that the fan nut is snug, and spin the fan by hand to feel for wobble. Tap the element shield and nearby brackets when cool; if they buzz, snug their screws. If nothing changes and the noise only appears at high heat the motor bearing or fan assembly is likely defective; document the symptom and use the warranty.

Been there. Mine did the exact thing where it was dead quiet until the last bit of preheat and then a loud buzz kicked in. The culprit was the ceiling plate over the element and fan. Once the unit was cold I honestly pulled the basket, removed the two small screws holding that plate, cleaned out a couple tiny crumbs, and reinstalled it with the screws snugged evenly. I also put a fingertip bend in the plate so it had a little spring tension when installed, which stopped it from drumming when hot. If your model has a rear exhaust cover, make sure the little baffle is not just kissing the backsplash because that will sing too at high airflow.

Another easy tell is the tilt test. With it running and making the noise, gently lift the front by a quarter inch using a wooden spoon under the feet. If the sound changes a lot, something loose inside is shifting on vibration and you will waste hours chasing it. At that point I would not hesitate to exchange it while you are inside the return window. If the maker will not swap it I would just return and get the that model Fryer Pro 9-in-1 since it runs quiet at full temp in my kitchen. Either way document what you tried and the temperature where it happens so support can see this is not user error. 📝

Heat induced rattles often come from parts that fit fine when cold but shift a hair as they expand. Try a quick threshold test first. Preheat to 350 then 375, then 390, listening for when it first appears. If it only shows up right near 400, press in on the handle while it is running to see if the drawer latch or rails are buzzing. If the pitch changes, a tolerance issue in the drawer is likely. You can confirm by sliding a tiny strip of folded foil between the rail and sidewall for a short supervised test. If that kills the noise and the tray or rails need tension or a missing bumper replaced and which is a warranty level fix on a month old unit.

Rule out the counter next. Move it a few inches away from the wall and rotate it 90 degrees, then park it on a heavy board or a silicone trivet that will not soften. If the sound drops, you were exciting the counter or splashback. Then check for hot warp. Set the crisper plate and basket on a perfectly flat surface when cold and again after a hot cycle to see if either rocks or the tabs no longer sit flush. A slight tweak to flatten the plate can quiet it, but if it returns when hot you should not keep bending things on a new appliance. Last, after a noisy run cancel and unplug, remove the basket, and look straight up with a flashlight for any shiny scrape ring around the fan or shroud. Any rub mark or a fan that coasts down with a tick says fan or bearing alignment, which you cannot solve without parts, so capture a short video of the noise and swap it under warranty. 📹