Keystone portable air conditioner displays P2 and may shut down or run fan only.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Clogged internal drain path between upper tray and lower tank, blocked upper drain hose, faulty upper float switch

Steps:

Drain both outlets: If the unit has upper and lower drain ports, drain both completely.
Clear internal passages: With panels removed, locate the small drain channels from the evaporator tray to the tank. Use a flexible brush or compressed air to clear slime and debris.
Inspect upper float: Ensure the upper float or sensor is not stuck in the raised position.
Replace sensor if needed: If P2 persists after cleaning and draining, replace the upper float switch or sensor assembly.

Medium 3/5

Upper Float Switch / Water Level Sensor

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