The answer to 'dehumidifier not working' is that there are several common causes, including a clogged air filter, a malfunctioning compressor, or a problem with the drainage system. Symptoms may include the dehumidifier not turning on, the unit not removing moisture effectively, or water leaking from the unit.
Some potential solutions include cleaning or replacing the air filter, checking the compressor and refrigerant levels, and ensuring the drainage system is working properly. If you're not comfortable troubleshooting the issue yourself, it's best to call a professional HVAC technician who can diagnose and repair the problem.