What to do if my Keystone KSTAP05PHA shows P1?
- JJose PhillipsAug 4, 2025
When the water level in the bottom tray reaches a certain point, your Keystone Air Conditioner will beep 8 times, and the display will show 'P1'. The cooling or dehumidifying will stop immediately. To fix this, move the unit to a drain, remove the bottom drain plug to drain the water, then reinstall the plug. Restart the unit until 'P1' disappears. If the error comes back, you may need to call for service.








