Display shows HI and the unit may run continuously or struggle to reach set temperature.

Safety: Unplug the unit before accessing internal components.

Steps:

• 1. Verify actual temperature: Use a separate thermometer. If the room is genuinely very hot, improve shading, close blinds, and reduce heat sources.
• 2. Check capacity: Confirm that the BTU rating of the Frigidaire unit matches the room size. An undersized unit will show HI frequently.
• 3. Inspect room sensor: Access and test the room thermistor. Replace if readings are inaccurate.
• 4. Clean filters and coils: Dirty coils reduce capacity and can cause the unit to run continuously without cooling effectively.