The answer to 'dehumidifier making noise' is that there are several common causes for a noisy dehumidifier, including a loose or worn fan, a faulty compressor, or an issue with the dehumidifier's internal components. Some key symptoms to look for include unusual rattling, humming, or vibrating sounds coming from the unit.
In many cases, these noises can be caused by simple issues that a homeowner may be able to address on their own, such as tightening loose parts or replacing worn components. However, if the noise is accompanied by other issues like reduced dehumidification performance or the unit won't turn on at all, it's best to call in a professional HVAC technician to diagnose and repair the problem.