The answer to 'why is my humidifier not working' is that there are several common causes, including a clogged filter, a broken water line, or a malfunctioning humidistat. Symptoms may include no visible mist, low humidity levels, or the humidifier running constantly without increasing moisture.
To troubleshoot, first check the humidifier filter and replace it if it's dirty or clogged. Next, inspect the water line for any leaks or blockages. If the filter and water line seem fine, the issue may be with the humidistat, which controls when the humidifier turns on and off. This component may need to be repaired or replaced by a professional HVAC technician.