While trying to fix a noisy microwave, an appliance repair old man tells to his apprentice the strangest stories he witnessed in his job: a single mother hypnotized by her washing machine, an electronics hobbyist tuning a ultrablack screen TV set, a neglected housewife in love with her refrigerator.

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Is it a trilogy or a TV show? Or is it a single 2 hour movie in 3 Acts with each act being a separate story?

If its a trilogy, you write the story for the first movie in the trilogy.

A Tv show simply the premise, who is our protagonist, his goal etc. don't need to go into the episodic storylines unless your writing loglines for each of the episodes.

If a 2 hour movie with 3 episodes contained within then yeah that's complicated but you've got to work out what's the connecting strand, why is the old repair man telling these stories. What's the point? What is the narrative through line?