P3
Keystone
Low Temperature Protection / Freeze Protection
Keystone portable air conditioner shows P3 and may not start the compressor.
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Possible Causes
Evaporator coil too cold, low ambient temperature, restricted airflow, faulty evaporator sensor
How to Fix / Troubleshooting
Steps:
- Check room temperature: Do not operate the unit in COOL mode if the room is below the minimum specified temperature.
- Clean filter and coil: Ensure good airflow through the evaporator.
- Allow thawing: If ice is present, unplug the unit and let it thaw completely.
- Sensor check: If P3 appears frequently under normal conditions, test and replace the evaporator sensor.
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Repair Difficulty
Easy
2/5
Required Part
Evaporator Temperature Sensor
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