Portable Hisense air conditioner displays P3 and stops or runs at reduced capacity.

Safety first: Unplug the unit before cleaning filters or coils.

• Step 1 – Check room temperature:
  • Ensure the room is within the operating range (typically above 17–18°C for cooling).
• Step 2 – Clean filters:
  • Remove and wash the air filters, then dry completely.
• Step 3 – Improve airflow:
  • Ensure intake and exhaust vents are not blocked.
  • Check that the exhaust hose is not excessively long or kinked.
• Step 4 – Allow thawing:
  • If ice is visible on the evaporator, leave the unit off until all ice melts.
• Step 5 – Technician service: If P3 persists in normal conditions, a technician should check refrigerant charge and the evaporator sensor.