What should I check when water leakage occurs in the indoor AC unit?

When the unit operates in cooling mode, almost always there is condensation of the water vapor that exists in the air. The condensation water is being collected in the drain tray of the indoor unit (condensate collector) and is being drained through the drainage hose. So, when water leakage occurs in the indoor unit, check the drainage pipe for obstructions or seizure and the hole of the drainage pipe in case there is an obstruction in the condensate collector. Also, you should check the leveling of the unit (it should not decline at any direction).