E9 appears on the display; unit may stop and beep; some portable Insignia models may also show a water full icon.

Safety first: Turn the unit off and unplug it before draining water. Water may spill when moving the unit.

Steps to address E9:

• 1. Drain the tank: On portable Insignia ACs, locate the lower drain plug at the back. Place a shallow pan or tray under the drain, remove the plug, and allow all water to drain out. Reinstall the plug securely.
• 2. Check float switch: Remove the rear panel to access the internal condensate tank and float assembly. Ensure the float moves freely up and down and is not stuck by dirt or scale.
• 3. Clean the tank: Wipe out any slime, mold, or debris from the tank that could interfere with the float. Use a mild bleach solution if needed, then rinse and dry.
• 4. Inspect wiring: Follow the float switch or water level sensor wires to the main PCB. Confirm the connector is tight and wires are not damaged.
• 5. Test float switch (for advanced DIYers): With the unit unplugged, disconnect the float switch and check continuity with a multimeter while moving the float. It should change state (open/close) as the float moves. Replace the float switch if it does not operate correctly.
• 6. Reset and test: Reassemble the unit, plug it in, and power on. If E9 persists with an empty tank and a good float switch, the main PCB input may be faulty and require replacement.