Some electric heaters (coffee maker, toaster ovens, portable hair dryers and possibly air fryers, use a thermal fuse to disable power instead of causing an electrical hazard. If you are familiar with electrical/electronic circuits, you may be able to identify if a thermal fuse is blown. It's wired into the hot side of the electrical wiring, often mechanically crimped onto solid wire. Sometimes encased in a heat resistant cloth like shield. It's round and similar to resistors but it protects against short circuiting. Over current demand, overheating, opens thermal fuses from heat, A multimeter measuring resistance is used to measure it; short/good, open/blown. This presumes the airfryer wasn't soaked in dishwasher or washed under a sink that may damage everything when reconnected to power.