Quick answer
The most common causes are clogged drain pipe, dirty fan coil, blocked drain pan, poor installation slope, or icing caused by airflow or refrigerant problems.
What you can safely do
- Turn off the unit if water is dripping near sockets or furniture.
- Place a pail or towel to protect the area.
- Clean filters if they are dirty.
- Note whether water comes from the fan coil, trunking, or wall.
What the technician should check
- Drain pipe blockage and drainage flow.
- Drain pan condition.
- Fan coil dirt buildup.
- Ice on coil or copper pipe.
- Installation slope if the leak has happened since installation.
Red flags
- Expensive repair quoted without checking the drain line.
- Chemical overhaul recommended before showing the coil condition.
- Repeated leak after recent servicing with no explanation.