The answer to 'ceiling fan not working' is that there are several common causes, including a faulty switch, loose wiring, or a problem with the motor. Symptoms may include the fan not turning on at all, the fan running slowly or intermittently, or unusual noises coming from the fan.
If the fan is not turning on, first check the wall switch or pull chain to ensure power is reaching the fan. Check the circuit breaker as well. If the fan is receiving power but not running, the issue may be with the motor or capacitor. This type of repair is usually best left to a professional electrician, as it requires disassembling the fan and testing internal components.