Portable Sharp AC: unit stops cooling; P3 displayed, often in low ambient conditions.

Safety first: Unplug the unit before cleaning filters or moving it.

• Check room temperature: Ensure the room is within the unit’s specified operating range (often above ~18°C for cooling).
• Clean filters and vents: Remove and clean filters. Ensure intake and exhaust vents are not blocked.
• Allow coil to defrost: If the unit has been running in a very cool room, let it sit off for 30–60 minutes, then restart.
• Sensor check: If P3 appears even in warm conditions, the evaporator thermistor may be faulty and should be replaced by a service technician.