Well, it could be :
thermostat. Basically, the fan starts when temp goes over a certain point, and cuts out again below that point. If the thermostat is broken, then the electrical signal doesn't go to the fan.
Broken wire between the thermostat and the fan. Same as above, but now a signal is being sent, but not received.
The fan itself, where it receives the signal telling it to start (probably a relay). If this relay is faulty, then, once again, the fan doesn't start.
Or a fuse. Now, the signal might be being sent, and received, but there is no power to run the fan. Or a cable between the fuse and the fan. Or a faulty earth wire.
Lots of possibilities
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