Unit switches itself from COOL to FAN or turns off cooling unexpectedly without any error code.

Safety: Unplug the unit before cleaning or accessing internal parts.

• Clean filters and coils: Ensure both evaporator and condenser coils and the air filter are clean.
• Check exhaust (portable units): Verify the exhaust hose is not kinked and is properly vented outdoors.
• Observe behavior: Note whether shutdowns occur after long run times or in very hot conditions, which suggests overheating.
• Sensor inspection: Inspect and reseat the evaporator and condenser sensors. Replace if they show signs of damage.
• Professional diagnosis: If protective shutdowns continue, a technician should check refrigerant pressures and sensor readings.