Portable or window-type Tristar air conditioner displays P1 and stops cooling; water tank icon may flash.

Safety first: Turn off and unplug the unit before draining water.

Steps to try:

• Empty the tank: Locate the drain plug or tank at the rear or bottom of the unit. Place a tray or bucket and remove the plug to drain all water.
• Clean the tank and float: If accessible, remove the tank and clean any slime or debris. Ensure the float moves freely.
• Check continuous drain option: If using a drain hose, ensure it is not kinked or elevated above the outlet.

When to call a technician: If P1 remains after draining and cleaning, the float switch or level sensor may need replacement.