P1 is displayed and the dehumidifier does not run; sometimes accompanied by a full tank icon.

Safety: Unplug the unit before tilting or opening it. Water may spill; protect flooring.

Steps:

• Drain water: Remove the external tank and empty it. If your Argo model has a continuous drain or pump outlet, disconnect the hose and ensure it is not kinked or blocked.
• Check internal tray: Some Argo dehumidifiers have an internal sump. Carefully tilt the unit slightly backward and to the side over a drain to allow trapped water to escape (do not exceed manufacturer tilt recommendations).
• Clean drain path: Use a flexible brush or pipe cleaner to clear the drain spout from the evaporator tray to the tank or hose connection.
• Inspect pump float switch (if equipped): Access the pump compartment and verify that the float moves freely. Clean any slime or debris. Test the switch with a multimeter and replace the Argo pump float switch if defective.
• Reassemble and test: Reconnect hoses, reinstall the tank, restore power, and confirm that P1 clears and normal operation resumes.