Why does my fan only work on one speed setting?

If one speed works but the others do not, the issue is usually in the control selection, the power supply or the internal switching. Stop using the fan if a setting causes unusual noise, heat or an intermittent start, because that can point to a fault.

1. Cycle the control slowly through each available speed and wait a few seconds at every position.

   Expected result: each setting should give a clearly different output.

2. Unplug the fan, then plug it into a different wall socket and test again.

   Expected result: the same settings should still work if the fan is healthy.

3. Check whether the control feels loose, stiff or unusually hard to turn.

   Expected result: the control should move normally without skipping positions.

4. Let the fan cool down if it has been running for a while, then retest every setting.

   Expected result: if a hot fan behaves differently, overheating may be involved.

5. If one or more speeds still do not work, stop using the fan and contact the retailer or store where it was purchased.

   Expected result: all available speed settings should operate as intended.