The answer to a humidifier not working is that there are several common causes, including mineral buildup, faulty sensors, or issues with the humidifier's internal components. Symptoms may include no moisture output, leaks, or the humidifier not turning on at all.
For minor issues, homeowners can often troubleshoot and fix the problem themselves by cleaning the humidifier, replacing filters, or checking the power supply. However, for more complex problems like a faulty humidifier control board or issues with the water supply, it's best to call in a professional HVAC technician who can properly diagnose and repair the system.