The answer to 'humidifier not heating' is that the most common causes are a faulty heating element, thermostat issues, or a problem with the water supply. If your humidifier is not producing warm mist, it may indicate that the heating element has failed and needs to be replaced. Another potential issue could be a malfunctioning thermostat that is not properly regulating the temperature. Additionally, if the water supply to the humidifier is blocked or restricted, it can prevent the unit from heating the water effectively.
In many cases, troubleshooting and repairing a humidifier that is not heating can be done as a DIY project. However, if you are not comfortable working with electrical components or are unsure of the root cause, it's best to call a professional HVAC technician to diagnose and repair the issue. They will have the necessary expertise and tools to properly identify and fix the problem, ensuring the safe and efficient operation of your humidifier.