Indoor unit shows E9 and may stop operation; sometimes associated with water leakage or defrost issues.

Safety first: Turn off the unit and disconnect power. Be prepared for water spillage when opening the indoor unit.

• Check drain pipe: Locate the condensate drain hose from the indoor unit. Ensure it is not kinked, elevated, or blocked. Blow through the hose from the outlet side to clear minor clogs.
• Clean drain pan: Remove the front cover and filters. Access the drain pan under the evaporator coil and remove sludge, algae, or debris using a wet/dry vacuum or cloth.
• Verify slope: Confirm the indoor unit is slightly tilted toward the drain side. Adjust mounting plate or brackets if water pools away from the drain.
• If E9 remains: The float switch or water level sensor may be defective and should be tested and replaced by a technician.