Carillon refers to a set of bells or a music box that plays a melody. It's a charming and somewhat old-fashioned word that evokes a sense of nostalgia and delicate beauty.
In the song, the carillon symbolizes recurring memories or moments, particularly those associated with sadness or longing. The singer mentions it will
Ernia is talking to someone who left, and he cannot decide whether she walked out or ran: "Sei partita via, sembravi fuggire" ("You left, you seemed to be running away"). Berlin is where she went, and it is also the weather between them, a grey the chorus keeps promising will lift. "Il grigio su Berlino se ne andrà" ("The grey over Berlin will go away") lands on "Come la maschera che indossi" ("Like the mask you wear"), so the city and her face end up in the same breath. That swap is the whole move of the song.
The second verse stops being about a breakup and turns out to be about a family. "Ad essere distanti siamo i CEO" ("At being distant we're the CEOs") is a joke he plainly means, and then he drops the joke: "Affoghiamo nel silenzio per non suscitare pena" ("We drown in silence so as not to stir up pity"), "Esser tutti d'un pezzo è solo scena, la rabbia ci avvelena" ("Being all of a piece is only a show, anger poisons us"). The line that gives the relationship away is "Tu sei svelta perché cammini come papà" ("You're quick because you walk like dad"). He never asks her to come back. He asks for one word: "Basta tu chieda aiuto che facciamo i bagagli" ("Just ask for help and we'll pack our bags").