The answer to 'my dehumidifier won't turn on' is that there could be several common causes, such as a power issue, a problem with the dehumidifier's controls, or a mechanical failure. First, check that the dehumidifier is properly plugged in and that the outlet is working. If the power seems to be on, inspect the control panel for any error codes or indicators that could point to a specific issue.
If the dehumidifier is receiving power but still won't turn on, the problem may be with the internal components, such as a faulty compressor or fan motor. In this case, it's usually best to call a professional HVAC technician to diagnose and repair the issue, as dehumidifier repairs often require specialized tools and expertise.