Why is the new oven squeaking?

At the second use, the new Cata oven (mechanical control) began to squeak (this was not the first time), it feels like a fan is beeping, the strongest sound in the timer area. When the oven is turned off, the fan runs and beeps, then turns off when the temperature drops. Is this normal or is there a malfunction? At first glance, everything works, heats up, cools down, turns off when necessary. Only this squeak annoys. Does it make sense to call a wizard? Thanks in advance.