You're standing in front of an ATM in Oaxaca that keeps flashing an error, or a ticket machine in a Mexico City metro station that swallows coins and gives nothing back. There'll be a sign taped to it — usually a scrap of cardboard with two words scrawled on it. Knowing which two words, and what they actually mean, is one of those tiny bits of Spanish that pays off immediately.
Mexican Spanish has two go-to phrases for things that don't work. No funciona comes from funcionar — to function — and is the closest thing to "out of order." No sirve, from servir (to serve), literally means "it doesn't serve," which in natural English is closer to "it's no use" or "it's useless."
Here's the thing, though: in everyday Mexico, the two are used almost interchangeably. A soda machine that takes your money but never drops the can, a change-giving ticket machine that doesn't give change, an ATM telling you to try again later — all of these might get labelled no sirve when no funciona would technically be more accurate. The logic is hard to argue with: if it's out of order, it's no use to you anyway. And when the thing that doesn't work is a proposed fix rather than a machine, no sirve and no funciona collapse into the same idea entirely.
The practical upshot for travellers is simple. Don't overthink it. If you see either phrase on a machine, a door, a toilet or a ticket window, it means the same thing: walk away and find another one. If you need to tell someone something isn't working — a hotel shower, a hire car, a wifi router — either phrase will be understood instantly, and nobody will raise an eyebrow at your choice. Mexicans, as the Mexperience piece puts it, aren't especially fussy about this grammatical fine print.
There's a charming exception that shows the limit of the country's linguistic flexibility. One Mexican legislator, accused of napping during parliamentary debates, insisted on a distinction between dormido (asleep) and durmiendo (sleeping) to defend himself. So while no one will care whether you say no sirve or no funciona about a broken coffee machine, some distinctions — apparently — do matter.
Why does any of this matter for a holiday? Because Mexico is full of hand-written signs, and misreading one wastes time. A card reading no sirve agua on a tap, a note on a lift, a sign on a beach kiosk — these are everyday signage, not formal notices. Recognising the pattern means fewer frustrating encounters with dead machines and more confidence handling small, mundane situations without reaching for a translation app. It's the kind of five-minute language prep that quietly improves a whole trip.
