The answer to 'my humidifier keeps shutting off' is that there are several common causes, including a malfunctioning humidistat, a clogged or dirty filter, low water pressure, or a problem with the humidifier's internal components. The symptoms can include the humidifier turning on and off repeatedly, not producing enough humidity, or shutting off entirely.
In many cases, you may be able to troubleshoot and fix the issue yourself, such as by cleaning the filter or checking the humidistat settings. However, if the problem persists or you're unsure of the cause, it's best to call a professional HVAC technician to diagnose and repair the issue. They can properly inspect the humidifier, identify the root cause, and make any necessary repairs or replacements to get your humidifier working reliably again.