Display shows H8 and the unit stops cooling; often associated with high ambient temperatures.

Safety: Unplug the unit. Do not attempt to open the sealed refrigeration system; this requires EPA-certified service.

• Improve airflow: Ensure the unit is not installed in a confined space. For portable units, shorten the exhaust hose if possible and avoid sharp bends.
• Clean filters and coils: Wash the air filter and clean both evaporator and condenser coils of dust and lint.
• Check condenser fan: Verify that the condenser fan runs at full speed when cooling is selected. If it is slow, noisy, or not running, the fan motor may be failing and should be replaced.
• Allow cool-down: Let the unit sit unplugged for 30–60 minutes to allow internal pressures to equalize and the overload to reset.
• Restart under lighter load: Restart the unit in COOL mode with a moderate temperature setting. If H8 recurs quickly, a high-pressure or refrigerant issue is likely and requires a professional technician.