The answer to 'why is my dehumidifier' is that there could be several common causes, such as a clogged air filter, a malfunctioning compressor, or a drainage issue. Symptoms may include the dehumidifier not turning on, not removing moisture effectively, or constantly running without reducing humidity levels.
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 the issue persists or you're unsure of the cause, it's best to call a professional HVAC technician to diagnose and repair the problem.