Display shows HI and unit may not reach set temperature

Safety: No internal work is usually required for a simple HI indication.

Steps:

• Verify actual temperature: Use a separate thermometer to confirm room temperature. If it is extremely high, allow time for the unit to cool the space.
• Improve conditions: Close windows and doors, use blinds to reduce solar gain, and reduce heat sources in the room.
• Sensor check: If the room is not excessively hot but HI is displayed, inspect and test the ambient sensor as in E1/F2.