I will continue this thread. The electrician found that the fan was broken and disconnected it from the cable, thanks to which the fan stopped working. I need to buy a new fan and have it installed. My doubts are about the cause. When I came home from work, there was no electricity in the apartment because the fuse had blown for some reason. (turning on the fuse restored electricity). While the apartment was empty, the electrical device that "worked" was most likely the dishwasher, but the switched off fuse concerned only the lights, the dishwasher is connected to another fuse, it works normally when the fuse that "went out" yesterday is turned off. When I arrived, the apartment's security alarm (detectors in several places of the apartment and a code entry device at the front door) was properly turned on and I turned it off with the code without any problems. The alarm is also not covered by this fuse, which turned out to be turned off. The roller shutter on the balcony door, operated by an electric motor, was slightly raised. When the power came back on, the blinds closed, the light in the bathroom came on, and that fan started humming, and I couldn't turn it off. People who left the apartment after me in the morning deny that they left the light on in the bathroom and that they turned on the fan. Could these devices turn on by themselves due to some "surge"?! Blind: if you press the closing switch, it closes automatically to the very end without even leaving a gap. The fuse probably "popped" at the end of its closing. However, did someone have to turn on the light, turn on the fan and just when he was leaving the house, and the blind was closing, there was a short-circuit in the running fan, damage to its function that was subject to switching off and thus blowing the fuse? Can the operation of the fan occur by some kind of self-excitation?!
