Indoor unit displays E9; unit may stop and beep; sometimes associated with water leakage or full drain pan.

Safety: Turn off power and place towels or a tray under the indoor unit to catch any water.

• Step 1 – Check drain hose: Locate the condensate drain hose exiting the indoor unit. Ensure it slopes downward continuously and is not kinked or elevated.
• Step 2 – Clear clogs: Disconnect the drain hose at the indoor unit or drain point. Use a wet/dry vacuum at the hose end to suck out sludge and debris. Flush with clean water.
• Step 3 – Inspect drain pan: Remove the front cover and inspect the internal drain pan for algae, slime, or debris. Clean with a mild bleach solution (wear gloves and eye protection).
• Step 4 – Check float switch: If your Senville model has a float switch or water level sensor, ensure it moves freely and is not stuck. Clean or replace if defective.
• Step 5 – Re-level unit: Verify the indoor unit is slightly tilted toward the drain side. Adjust mounting bracket if necessary.
• Step 6 – Test: Restore power and run in COOL mode. Pour a small amount of water into the drain pan to confirm proper drainage and absence of E9.