Hi or Lo is a message indicating indoor temperature.
It is not an error indicating failure. Feel at ease.
Try this
[Lo] is shown on the display when indoor temperature is 10℃(50°F) or lower. [Abbreviation of Low]
[Hi] is shown on the display when indoor temperature is 36℃(96.8°F) or higher. [Abbreviation of High]
This guide was created for all models, so the images or content may be different from your product.