1. Turn off the power to the air conditioner.
2. Locate the leak. The leak is likely to be coming from a hose or pipe connection.
3. Tighten the loose hose or pipe connection. If the connection is damaged, you may need to replace it.
4. If the leak is coming from a refrigerant line, you will need to have it repaired by a qualified technician.
5. Once the leak is fixed, turn on the power to the air conditioner and check for any further leaks.