The answer to 'HVAC system leaking water' is that there are several common causes for an HVAC system to leak water, including a clogged condensate drain line, a problem with the condensate pump, a cracked or damaged drain pan, or a refrigerant leak. Symptoms of a water leak can include standing water around the HVAC unit, water stains on walls or ceilings, or excess moisture in the home.
In many cases, the cause of the leak can be identified and fixed through basic troubleshooting and maintenance. However, some issues may require the expertise of a professional HVAC technician, especially if the leak is due to a refrigerant leak or a more complex problem with the system. It's generally best to call a professional if you are not comfortable performing the necessary repairs or if the leak appears to be severe.