Fix / Split System AC — Indoor Unit / Water leaking or dripping inside

AC (indoor) water leaking or dripping inside?

A frozen evaporator coil, caused by low refrigerant or poor airflow, melts unevenly and overwhelms the drain pan, causing dripping.

• Heat Exchanger (Evaporator)

  Moderate DIY Part: $150–$350

• Air Filter

  Easy DIY Part: $10–$25

  A blocked filter restricts airflow, causing the coil to freeze and then flood the drain pan when it thaws.

• Cross Flow Fan

  Hard DIY Part: $30–$70

  Dirt buildup on the fan blades can fling condensate outward off the normal drain path instead of allowing it to drip into the pan.

• Main PCB

  Moderate DIY Part: $80–$200

  A faulty PCB may run the unit erratically, causing freeze-thaw cycles that overwhelm the condensate drain system.