Why is my air handler leaking water and how can I fix it?

Your air handler may be leaking water due to a clogged condensate drain line, a dirty air filter, or a frozen evaporator coil. To fix it, you can try cleaning the condensate drain line, replacing the air filter, and checking for any ice buildup on the evaporator coil. If the issue persists, it's best to contact a professional HVAC technician for further inspection and repair.